Relevant bibliographies by topics / Qubits

Academic literature on the topic 'Qubits'

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Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Qubits"

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Bluvstein, Dolev, Harry Levine, Giulia Semeghini, Tout T. Wang, Sepehr Ebadi, Marcin Kalinowski, Alexander Keesling, et al. "A quantum processor based on coherent transport of entangled atom arrays." Nature 604, no. 7906 (April 20, 2022): 451–56. http://dx.doi.org/10.1038/s41586-022-04592-6.

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AbstractThe ability to engineer parallel, programmable operations between desired qubits within a quantum processor is key for building scalable quantum information systems1,2. In most state-of-the-art approaches, qubits interact locally, constrained by the connectivity associated with their fixed spatial layout. Here we demonstrate a quantum processor with dynamic, non-local connectivity, in which entangled qubits are coherently transported in a highly parallel manner across two spatial dimensions, between layers of single- and two-qubit operations. Our approach makes use of neutral atom arrays trapped and transported by optical tweezers; hyperfine states are used for robust quantum information storage, and excitation into Rydberg states is used for entanglement generation3–5. We use this architecture to realize programmable generation of entangled graph states, such as cluster states and a seven-qubit Steane code state6,7. Furthermore, we shuttle entangled ancilla arrays to realize a surface code state with thirteen data and six ancillary qubits8 and a toric code state on a torus with sixteen data and eight ancillary qubits9. Finally, we use this architecture to realize a hybrid analogue–digital evolution2 and use it for measuring entanglement entropy in quantum simulations10–12, experimentally observing non-monotonic entanglement dynamics associated with quantum many-body scars13,14. Realizing a long-standing goal, these results provide a route towards scalable quantum processing and enable applications ranging from simulation to metrology.
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Yuan, Wei-Ping, Zhi-Cheng He, Sai Li, and Zheng-Yuan Xue. "Fast Reset Protocol for Superconducting Transmon Qubits." Applied Sciences 13, no. 2 (January 6, 2023): 817. http://dx.doi.org/10.3390/app13020817.

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For larger-scale quantum information processing, qubit reset plays an important role, as the coherent times for qubits are limited. However, previous schemes require either long reset times or a complex pulse calibration technique, leading to low efficiency in qubit reset. Here, we propose a fast and simple reset protocol for superconducting transmon qubits based on the coupler-coupled qubits architecture. In this setup, a mixing pulse is used to transfer the qubit excitation to the combined excitation of a low-qulity coupler and readout resonator, which will quickly decay to their respectively ground states, leading to efficient qubit reset to the ground state. Our numerical results show that the residual population of the qubit’s excited state can be suppressed to 0.04% within 28 ns; the reset time will be 283 ns if photon depletion of the readout resonator is required. Thus, our protocol provides a promising way for the high-efficiency superconducting qubit reset.
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Bhattacharyya, Shaman, and Somnath Bhattacharyya. "Demonstration of the Holonomically Controlled Non-Abelian Geometric Phase in a Three-Qubit System of a Nitrogen Vacancy Center." Entropy 24, no. 11 (November 2, 2022): 1593. http://dx.doi.org/10.3390/e24111593.

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The holonomic approach to controlling (nitrogen-vacancy) NV-center qubits provides an elegant way of theoretically devising universal quantum gates that operate on qubits via calculable microwave pulses. There is, however, a lack of simulated results from the theory of holonomic control of quantum registers with more than two qubits describing the transition between the dark states. Considering this, we have been experimenting with the IBM Quantum Experience technology to determine the capabilities of simulating holonomic control of NV-centers for three qubits describing an eight-level system that produces a non-Abelian geometric phase. The tunability of the geometric phase via the detuning frequency is demonstrated through the high fidelity (~85%) of three-qubit off-resonant holonomic gates over the on-resonant ones. The transition between the dark states shows the alignment of the gate’s dark state with the qubit’s initial state hence decoherence of the multi-qubit system is well-controlled through a π/3 rotation.
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Takeda, Kenta, Akito Noiri, Takashi Nakajima, Takashi Kobayashi, and Seigo Tarucha. "Quantum error correction with silicon spin qubits." Nature 608, no. 7924 (August 24, 2022): 682–86. http://dx.doi.org/10.1038/s41586-022-04986-6.

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AbstractFuture large-scale quantum computers will rely on quantum error correction (QEC) to protect the fragile quantum information during computation1,2. Among the possible candidate platforms for realizing quantum computing devices, the compatibility with mature nanofabrication technologies of silicon-based spin qubits offers promise to overcome the challenges in scaling up device sizes from the prototypes of today to large-scale computers3–5. Recent advances in silicon-based qubits have enabled the implementations of high-quality one-qubit and two-qubit systems6–8. However, the demonstration of QEC, which requires three or more coupled qubits1, and involves a three-qubit gate9–11 or measurement-based feedback, remains an open challenge. Here we demonstrate a three-qubit phase-correcting code in silicon, in which an encoded three-qubit state is protected against any phase-flip error on one of the three qubits. The correction to this encoded state is performed by a three-qubit conditional rotation, which we implement by an efficient single-step resonantly driven iToffoli gate. As expected, the error correction mitigates the errors owing to one-qubit phase-flip, as well as the intrinsic dephasing mainly owing to quasi-static phase noise. These results show successful implementation of QEC and the potential of a silicon-based platform for large-scale quantum computing.
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Zakharov, R. K., and E. K. Bashkirov. "Entanglement of two dipole-coupled qubits induced by a thermal field of one-mode lossless cavity with Kerr medium." Journal of Physics: Conference Series 2086, no. 1 (December 1, 2021): 012216. http://dx.doi.org/10.1088/1742-6596/2086/1/012216.

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Abstract We studied the dynamics of two qubits interacting with one-mode thermal quantum electromagnetic field of microwave cavity with Kerr medium. Using the exact solution for considered model we derived the qubit-qubit negativity for separa coherent initial qubits states. We showed that initial qubits coherencee interaction can greatly enhance the degree of qubits entanglement in the presence of the Kerr nonlinearity and dipole-dipole interactionyeven for high thermal field intensities.
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FUJII, TOSHIYUKI, MUNEHIRO NISHIDA, SATOSHI TANDA, and NORIYUKI HATAKENAKA. "TALKING BREATHER QUBITS." International Journal of Modern Physics B 23, no. 20n21 (August 20, 2009): 4352–64. http://dx.doi.org/10.1142/s0217979209063511.

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Breather is an elementary excitation regarded as a bound state of a fluxon and an antifluxon in a long Josephson junction. In quantum-mechanical regime, the breather energy is quantized so that the breather can be considered as an artificial moving atom. We propose a new type of fluxon qubit that is constructed by quantum-mechanical superposition of the breather's states. We describe quantum logic gates of breather qubit required for constructing quantum computer. In addition, our qubit can move in the system so that transfer of quntum information is possible between mobile qubits as well as stationary qubits. Our talking qubits support the global information sharing in quantum information networks.
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Bultrini, Daniel, Samson Wang, Piotr Czarnik, Max Hunter Gordon, M. Cerezo, Patrick J. Coles, and Lukasz Cincio. "The battle of clean and dirty qubits in the era of partial error correction." Quantum 7 (July 13, 2023): 1060. http://dx.doi.org/10.22331/q-2023-07-13-1060.

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When error correction becomes possible it will be necessary to dedicate a large number of physical qubits to each logical qubit. Error correction allows for deeper circuits to be run, but each additional physical qubit can potentially contribute an exponential increase in computational space, so there is a trade-off between using qubits for error correction or using them as noisy qubits. In this work we look at the effects of using noisy qubits in conjunction with noiseless qubits (an idealized model for error-corrected qubits), which we call the "clean and dirty" setup. We employ analytical models and numerical simulations to characterize this setup. Numerically we show the appearance of Noise-Induced Barren Plateaus (NIBPs), i.e., an exponential concentration of observables caused by noise, in an Ising model Hamiltonian variational ansatz circuit. We observe this even if only a single qubit is noisy and given a deep enough circuit, suggesting that NIBPs cannot be fully overcome simply by error-correcting a subset of the qubits. On the positive side, we find that for every noiseless qubit in the circuit, there is an exponential suppression in concentration of gradient observables, showing the benefit of partial error correction. Finally, our analytical models corroborate these findings by showing that observables concentrate with a scaling in the exponent related to the ratio of dirty-to-total qubits.
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Chao, Rui, Michael E. Beverland, Nicolas Delfosse, and Jeongwan Haah. "Optimization of the surface code design for Majorana-based qubits." Quantum 4 (October 28, 2020): 352. http://dx.doi.org/10.22331/q-2020-10-28-352.

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The surface code is a prominent topological error-correcting code exhibiting high fault-tolerance accuracy thresholds. Conventional schemes for error correction with the surface code place qubits on a planar grid and assume native CNOT gates between the data qubits with nearest-neighbor ancilla qubits.Here, we present surface code error-correction schemes using only Pauli measurements on single qubits and on pairs of nearest-neighbor qubits. In particular, we provide several qubit layouts that offer favorable trade-offs between qubit overhead, circuit depth and connectivity degree. We also develop minimized measurement sequences for syndrome extraction, enabling reduced logical error rates and improved fault-tolerance thresholds.Our work applies to topologically protected qubits realized with Majorana zero modes and to similar systems in which multi-qubit Pauli measurements rather than CNOT gates are the native operations.
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LIU, YANG, GUI LU LONG, and YANG SUN. "ANALYTIC ONE-BIT AND CNOT GATE CONSTRUCTIONS OF GENERAL n-QUBIT CONTROLLED GATES." International Journal of Quantum Information 06, no. 03 (June 2008): 447–62. http://dx.doi.org/10.1142/s0219749908003621.

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General n-qubit controlled unitary gates are frequently used in quantum information processing tasks. Barenco, Bennett, Cleve, Di Vincenzo, Margolus and Shor [Phys. Rev. A52 (1995) 3457] have given the general construction methods, and explicit results for up-to-four-qubits controlled unitary gates. We extended their calculation and gave two analytic expressions for the construction of general n-qubit controlled unitary gates in terms of one-qubit and two-qubit CNOT gates. There are two expressions – one is exponential in the qubit number which is efficient for up to ten qubits, and the other is polynomial in the qubit number, which is efficient for more than ten qubits.
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Militello, Benedetto, and Anna Napoli. "Synchronizing Two Superconducting Qubits through a Dissipating Resonator." Entropy 23, no. 8 (July 31, 2021): 998. http://dx.doi.org/10.3390/e23080998.

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A system consisting of two qubits and a resonator is considered in the presence of different sources of noise, bringing to light the possibility of making the two qubits evolve in a synchronized way. A direct qubit–qubit interaction turns out to be a crucial ingredient, as well as the dissipation processes involving the resonator. The detrimental role of the local dephasing of the qubits is also taken into account.
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Dissertations / Theses on the topic "Qubits"

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Saldivar, Alexis David. "Correlações quânticas de dois qubits em estados de quatro qubits." Universidade Estadual de Londrina. Centro de Ciências Exatas. Programa de Pós-Graduação em Física, 2016. http://www.bibliotecadigital.uel.br/document/?code=vtls000206310.

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As correlações quânticas desempenham um papel importante na computação quântica. Em comparação com a computação clássica, muitas tarefas podem ser implementadas com uma eficiência significativamente maior quando são usadas as propriedades quânticas de um sistema. O emaranhamento quântico é considerado o principal recurso físico, responsável na melhoria da eficiência de tarefas computacionais. Neste trabalho, é destacada a existência de correlações quânticas que vão além do emaranhamento. Cada átomo de um par de átomos de dois níveis, inicialmente emaranhados, é colocado numa cavidade óptica independente. A dinâmica do emaranhamento dos estados reduzidos dos átomos exibe o fenômeno de morte súbita e renascimento do emaranhamento, que apresenta um cenário interessante para o estudo de correlações de dois corpos. Não é considerado a interação entre o sistema quântico e o ambiente. Negatividade da transposta parcial do estado de qubits atômicos é usado como medida de emaranhamento do estado de dois qubits. Foram obtidas expressões analíticas para a entropia condicional e a discordância quântica, seguido de cálculos numéricos. Para examinar as relações entre correlações presentes no estado composto e a pureza do estado atômico, foi feito também um cálculo na primeira ordem de aproximação para a discordância. Isso implicou na substituição da entropia de Von Neumann pela entropia linear na definição da discordância quântica. Foi usado um programa escrito em fortran para gerar os valores numéricos dos quantificadores de correlações clássicas e quânticas, para casos onde o quadrado de negatividade do estado atômico tem valores inicias 0,35 e 0,90. A discordância quântica, plotada como função do parâmetro de interação tem valores positivos durante o intervalo entre a morte súbita e o renascimento, isso é, o intervalo de tempo durante o qual o emaranhamento livre entre os qubits atômicos é zero, exceto onde o estado é separável. Também foi calculada a discordância quântica no contexto dos operadores de medida fraca, de maneira a estudar as correlações chamadas de super discordância quântica. Os gráficos que correspondem ao uso de operadores de medida fraca mostram um aumento nas correlações quânticas comparado com a discordância quântica usual obtida através de medidas projetivas ou de Von Neumann.
Quantum correlations play an important role in quantum computation. In comparison with classical computation, several tasks can be implemented with significantly higher efficiency when quantum properties of a system are used. Quantum entanglement is considered the main physical resource, responsible for improving the efficiency of computational tasks. In this work, the existence of quantum correlations that go beyond entanglement is highlighted. Each atom of a pair of two level atoms in entangled state, is placed in an independent optical cavity. Entanglement dynamics of the two atom reduced state exhibits the phenomenon of sudden death and rebirth of entanglement, which presents an interesting scenario to study two body correlations. Interaction of the quantum system with environment is not considered. Negativity of partial transpose of the state of atomic qubits is used as the measure of entanglement of two qubit state. Analytical expressions have been obtained for conditional entropy and quantum discord, followed by numerical calculations. To examine the relationship between the correlations present in the composite state and the purity of atomic state, calculation of first order approximation to discord have also been done. It involves replacing von Neumann entropy by linear entropy in the definition of quantum discord. A program written in fortran has been used to generate numerical values of quantifiers of classical and quantum correlations for cases where the entangled initial state of atoms has squared negativity value of 0,35 and 0,90. Quantum discord, plotted as a function of interaction parameter, is found to be positive definite during the interval between sudden death and rebirth, that is, the time interval during which the free entanglement between atomic qubits is zero, except where the state is separable. Quantum discord has also been calculated in the context of weak measurement operators, in order to study the correlations called super quantum discord. The graphs corresponding to the use of weak measurement operators show an increase in quantum correlations as compared to the usual quantum discord obtained through projective von Neumann measurement.
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Rodrigues, Denzil Anthony. "Superconducting charge qubits." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396688.

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Strauch, Frederick W. "Theory of superconducting phase qubits." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/2063.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.
Thesis research directed by: Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Tang, Wai Ho. "Quantum Entanglement and Superconducting Qubits." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-32238.

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Conventional computing based on classical technologies is approaching its limits. Therefore scientists are starting to consider the applications of quantum mechanics as a means for constructing more powerful computers. After proposing theoretical methods, many experimental setups have been designed to achieve quantum computing in reality. This thesis gives some background information on the subject of quantum computing. We first review the concept of quantum entanglement, which plays a key role in quantum computing, and then we discuss the physics of the SQUIDs-cavity method proposed by Yang et al., and give the definitions of quantum gates which are the elements that are needed to construct quantum circuits. Finally we give an overview of recent developments of SQUIDs-cavity systems and quantum circuits after Yang et al.'s proposal in 2003. These new developments help to take a step towards the constructions of higher levels of quantum technologies, e.g. quantum algorithms and quantum circuits.
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Conway, Lamb Ian. "Cryogenic Control Beyond 100 Qubits." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/17046.

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Quantum computation has been a major focus of research in the past two decades, with recent experiments demonstrating basic algorithms on small numbers of qubits. A large-scale universal quantum computer would have a profound impact on science and technology, providing a solution to several problems intractable for classical computers. To realise such a machine, today's small experiments must be scaled up, and a system must be built which provides control and measurement of many hundreds of qubits. A device of this scale is challenging: qubits are highly sensitive to their environment, and sophisticated isolation techniques are required to preserve the qubits' fragile states. Solid-state qubits require deep-cryogenic cooling to suppress thermal excitations. Yet current state-of-the-art experiments use room-temperature electronics which are electrically connected to the qubits. This thesis investigates various scalable technologies and techniques which can be used to control quantum systems. With the requirements for semiconductor spin-qubits in mind, several custom electronic systems, to provide quantum control from deep cryogenic temperatures, are designed and measured. A system architecture is proposed for quantum control, providing a scalable approach to executing quantum algorithms on a large number of qubits. Control of a gallium arsenide qubit is demonstrated using a cryogenically operated FPGA driving custom gallium arsenide switches. The cryogenic performance of a commercial FPGA is measured, as the main logic processor in a cryogenic quantum control system, and digital-to-analog converters are analysed during cryogenic operation. Recent work towards a 100-qubit cryogenic control system is shown, including the design of interconnect solutions and multiplexing circuitry. With qubit fidelity over the fault-tolerant threshold for certain error correcting codes, accompanying control platforms will play a key role in the development of a scalable quantum machine.
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Silva, Alcenísio José de Jesus. "Probabilidades negativas e tomografia de Qubits." Universidade Federal de São Carlos, 2007. https://repositorio.ufscar.br/handle/ufscar/4997.

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Made available in DSpace on 2016-06-02T20:16:42Z (GMT). No. of bitstreams: 1 1653.pdf: 1076652 bytes, checksum: 1961cc3ed414f75dc01fe54141a52bb2 (MD5) Previous issue date: 2007-03-28
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In this dissertation we approached the tomography of discrete systems, understood as the representation and the reconstruction of states. For the tomography we used distribution functions of symmetrical pseudo-probabilities. The coefficients of the distribution function of "probabilities" are "joint probabilities", that eventually can be negative, associated to incompatible observables. The "negative probabilities" contains not only information about the measurements of counts, but also on the quantum state of the systems. We present the argument of Scully, Walther and Schleich that uses double slit interference to give a meaning to the "negative probabilities" and we propose one alternative example using beam splitters and an single photon. Like this, moreover we define distribution functions based in generalized quantization axes for any directions, we present the physical interpretation of the resulting "negative probabilities". We showed the reason because all explanation usually done to justify "negative probabilities" seems to be contradictory and are not convincing. Is the interpretation of the "negative probabilities" that retain the heart, not only of the present work, but also, of the whole Quantum Mechanics, its only mystery, as Feynman says
Nesta dissertação abordamos a tomografia de sistemas discretos, entendida como a representação e a reconstrução de estados. Para a tomografia utilizamos funções distribuição de pseudo-probabilidades simétricas. Os coeficientes dessa função distribuição de "probabilidades" são "probabilidades conjuntas", que eventualmente podem ser negativas, associadas a observáveis incompatíveis. As "probabilidades negativas" contém não só informação sobre as medições de contagens, mas também sobre o estado quântico dos sistemas. Apresentamos o argumento de Scully, Walther e Schleich que utiliza interferência na dupla-fenda para dar um significado às "probabilidades negativas" e propomos um exemplo alternativo utilizando divisores de feixe e um único fóton. Assim, além de definir funções de distribuição baseadas em eixos de quantização generalizados para direções quaisquer, apresentamos a interpretação física das "probabilidades negativas" decorrentes. Mostramos porque toda explicação que possa ser feita para justificar "probabilidade negativa" parece ser contraditória e não é convincente. É na interpretação das pseudo-probabilidades onde está o coração não só do presente trabalho, mas também, de toda a Mecânica Quântica, o seu único mistério, como diz Feynman
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Blais, Alexandre. "Calcul quantique universel sur qubits supraconducteurs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0031/MQ67692.pdf.

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Paik, Han-hee. "Coherence in dc SQUID phase qubits." College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/7469.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.
Thesis research directed by: Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Schriefl, Josef [Verfasser]. "Decoherence in Josephson Qubits / Josef Schriefl." Aachen : Shaker, 2005. http://d-nb.info/1186579161/34.

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Kannan, Bharath. "Waveguide quantum electrodynamics with superconducting qubits." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120400.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 85-87).
Experiments in quantum optics have long been implemented with atoms in 3D free space or with atoms interacting with cavities. Over the past decade, the field of microwave quantum optics using superconducting circuits has gained a tremendous amount of attention. In particular, the confinement of photonic modes to 1D enables a new parameter regime of strong interactions between qubits and open waveguides. In these setups, known as waveguide quantum electrodynamics (WQED), superconducting qubits interact with a continuum of propagating photonic modes. In this thesis, we will explore the physics of WQED devices that consist of multiple qubits and their potential application to quantum information and simulation.
by Bharath Kannan.
S.M.
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Books on the topic "Qubits"

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1941-, Ganten D., ed. Gene, Neurone, Qubits & Co.: Unsere Welten der Information. Stuttgart: Hirzel, 1999.

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Pandey, Rajiv, Nidhi Srivastava, Neeraj Kumar Singh, and Kanishka Tyagi, eds. Quantum Computing: A Shift from Bits to Qubits. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-9530-9.

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Grèzes, Cécile. Towards a Spin-Ensemble Quantum Memory for Superconducting Qubits. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-21572-3.

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Sansoni, Linda. Integrated Devices for Quantum Information with Polarization Encoded Qubits. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07103-9.

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Burger, John Robert. Brain Theory From A Circuits And Systems Perspective: How Eectrical Science Explains Neuro-circuits, Neuro-systems, and Qubits. New York, NY: Springer New York, 2013.

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Hays, Max. Realizing an Andreev Spin Qubit. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-83879-9.

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Yuzhao, Li, ed. Huo Qubing. Taibei Shi: Shi xue she chu ban gu fen you xian gong si, 2000.

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Yi, Zhang, ed. Chen Qubing quan ji. Shanghai: Shanghai gu ji chu ban she, 2009.

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Alvarez, Raúl Aguiar. Qubit: Antología de la nueva ciencia ficción latinoamericana. La Habana, Cuba: Fondo Editorial Casa de las Américas, 2011.

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Anru, Yin, and Liu Yingbai, eds. Chen Qubing shi wen ji. Beijing: She hui ke xue wen xian chu ban she, 2009.

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Book chapters on the topic "Qubits"

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Baker, Joanne. "Qubits." In 50 Schlüsselideen Quantenphysik, 176–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-45033-8_45.

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Lemmer, Boris, Benjamin Bahr, and Rina Piccolo. "Qubits." In Quirky Quarks, 203–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-50259-4_50.

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Busch, Paul, Pekka Lahti, Juha-Pekka Pellonpää, and Kari Ylinen. "Qubits." In Quantum Measurement, 319–43. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43389-9_14.

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Bahr, Benjamin, Boris Lemmer, and Rina Piccolo. "Qubits." In Quirky Quarks, 198–201. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49509-4_48.

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LaPierre, Ray. "Qubits." In The Materials Research Society Series, 57–72. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69318-3_4.

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Tamura, Kentaro, and Yutaka Shikano. "Quantum Random Numbers Generated by a Cloud Superconducting Quantum Computer." In International Symposium on Mathematics, Quantum Theory, and Cryptography, 17–37. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5191-8_6.

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Abstract A cloud quantum computer is similar to a random number generator in that its physical mechanism is inaccessible to its users. In this respect, a cloud quantum computer is a black box. In both devices, its users decide the device condition from the output. A framework to achieve this exists in the field of random number generation in the form of statistical tests for random number generators. In the present study, we generated random numbers on a 20-qubit cloud quantum computer and evaluated the condition and stability of its qubits using statistical tests for random number generators. As a result, we observed that some qubits were more biased than others. Statistical tests for random number generators may provide a simple indicator of qubit condition and stability, enabling users to decide for themselves which qubits inside a cloud quantum computer to use.
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Hughes, Ciaran, Joshua Isaacson, Anastasia Perry, Ranbel F. Sun, and Jessica Turner. "Entanglement." In Quantum Computing for the Quantum Curious, 59–71. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-61601-4_7.

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AbstractSo far, we have discussed the manipulation and measurement of a single qubit. However, quantum entanglement is a physical phenomenon that occurs when multiple qubits are correlated with each other. Entanglement can have strange and useful consequences that could make quantum computers faster than classical computers. Qubits can be “entangled,” providing hidden quantum information that does not exist in the classical world. It is this entanglement that is one of the main advantages of the quantum world!
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Bergou, János A., Mark Hillery, and Mark Saffman. "Atomic Qubits." In Graduate Texts in Physics, 221–51. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75436-5_13.

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Bergou, János A., Mark Hillery, and Mark Saffman. "Optical Qubits." In Graduate Texts in Physics, 253–68. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75436-5_14.

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LaPierre, Ray. "Superconducting Qubits." In The Materials Research Society Series, 285–322. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69318-3_22.

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Conference papers on the topic "Qubits"

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Nori, Franco. "Quantum-information-processing using superconducting qubit circuits." In Workshop on Entanglement and Quantum Decoherence. Washington, D.C.: Optica Publishing Group, 2008. http://dx.doi.org/10.1364/weqd.2008.sss2.

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Superconducting (SC) circuits can behave like atoms making transitions between a few energy levels. Such circuits can test quantum mechanics at macroscopic scales and be used to conduct atomic-physics experiments on a silicon chip. This talk overviews a few of our theoretical studies on SC circuits and quantum information processing (QIP) including: SC qubits for single photon generation and for lasing; controllable couplings among qubits; how to increase the coherence time of qubits using a capacitor in parallel to one of the qubit junctions; hybrid circuits involving both charge and flux qubits; testing Bell’s inequality in SC circuits; generation of GHZ states; quantum tomography in SC circuits; preparation of macroscopic quantum superposition states of a cavity field via coupling to a SC qubit; generation of nonclassical photon states using a SC qubit in a microcavity; scalable quantum computing with SC qubits; and information processing with SC qubits in a microwave field. Controllable couplings between qubits can be achieved either directly or indirectly. This can be done with and without coupler circuits, and with and without data-buses like EM fields in cavities (e.g., we will describe both the variable-frequency magnetic flux approach and also a generalized double-resonance approach that we introduced). It is also possible to “turn a quantum bug into a feature” by using microscopic defects as qubits, and the macroscopic junction as a controller of it. We have also studied ways to implement radically different approaches to QIP by using “cluster states” in SC circuits.
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Sola, Ignacio R., and Bo Y. Chang. "Spatiotemporal Control of Trapped Rydberg Qubits." In Quantum 2.0. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/quantum.2022.qw2a.33.

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We show how to implement faster high fidelity two-qubit gates on neutral atoms through the dipole blockade mechanism by exciting the qubits with the same pulses after optimizing both temporal and spatial parameters.
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Siraichi, Marcos Yukio, Fernando Magno Quintão Pereira, Vinicius Dos Santos, and Caroline Collange. "Qubit Allocation." In Concurso de Teses e Dissertações da SBC. Sociedade Brasileira de Computação - SBC, 2020. http://dx.doi.org/10.5753/ctd.2020.11368.

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The availability of the first prototypes of quantum computers, in 2016, with free access through the cloud, brought much enthusiasm to the research community. Yet, programming said computers is difficult. One core challenge is the so called qubit allocation problem. This problem consists in mapping the virtual qubits that make up a logical quantum program onto the physical qubits that exist in the target quantum architecture. To deal with this challenge, we have proposed one of the first algorithms to solve qubit allocation. This algorithm, together with its ensuing formulations, is today available in the Enfield compilera concrete product of this work. Our first paper in this field, titled Qubit Allocation, has inspired much research, and our latest qubit allocation design, called Bounded Mapping Tree, stands out today as one of the most effective qubit allocators in the world.
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Zhang, H., L. Wan, T. Haug, WK Mok, M. S. Kim, L. C. Kwek, and A. Q. Liu. "On-Chip Quantum Autoencoder for Teleportation of High-Dimensional Quantum States." In CLEO: QELS_Fundamental Science. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_qels.2022.fw1a.3.

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Currently most quantum teleportation experiments are based on qubits. Here, we demonstrate a quantum autoencoder assisted teleportation for high-dimensional quantum states. Our method of training the autoencoder allows us to take a finite sample of those states, learn how to compress them to qubits with nearly unit fidelity. High fidelity is achieved between the input qutrit and the qutrit recovered from the teleported qubit.
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Chan, Stanley, Zbigniew Ficek, and Margaret Reid. "Entanglement Evolution Between Two Isolated Multiqubit Systems." In Workshop on Entanglement and Quantum Decoherence. Washington, D.C.: Optica Publishing Group, 2008. http://dx.doi.org/10.1364/weqd.2008.embs1.

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We examine the time evolution of entanglement between two qubits of a system of four qubits. The system is composed of two separate cavities each containing a single two-level atom. The qubits of the system are the two atoms and the two cavity modes. We show that during the transfer of an initial entanglement from atoms to the cavity modes, an additional entanglement is induced between the atoms and the cavity modes. Thus, during the evolution, the system effectively behaves as a six qubit system. In addition, we study the entanglement evolution for an imperfect matching of the atoms to the cavity modes. We show that the imperfect matching can force a stable entangled state to evolve in time and may produce a continuous entanglement in time.
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Lu, Chao, Zhao Hu, Bei Xie, and Ning Zhang. "Quantum CFD Simulations for Heat Transfer Applications." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23915.

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Abstract In this paper, computational heat transfer (CHT) equations were solved using the state-of-art quantum computing (QC) technology. The CHT equations can be discretized into a linear equation set, which can be possibly solved by a QC system. The linear system can be characterized by Ax = b. The A matrix in this linear system is a Hermitian matrix. The linear system is then solved by using the HHL algorithm, which is a quantum algorithm to solve a linear system. The quantum circuit requires an Ancilla qubit, clock qubits, qubits for b and a classical bit to record the result. The process of the HHL algorithm can be described as follows. Firstly, the qubit for b is initialized into the phase as desire. Secondly, the quantum phase estimation (QPE) is used to determine the eigenvalues of A and the eigenvalues are stored in clock qubits. Thirdly, a Rotation gate is used to rotate the inversion of eigenvalues and information is passed to the Ancilla bit to do Pauli Y-rotation operation. Fourthly, revert the whole processes to untangle qubits and measure all of the qubits to output the final results for x. From the existing literature, a few 2 × 2 matrices were successfully solved with QC technology, proving the possibility of QC on linear systems [1]. In this paper, a quantum circuit is designed to solve a CHT problem. A simple 2 by 2 linear equation is modeled for the CHT problem and is solved by using the quantum computing. The result is compared with the analytical result. This result could initiate future studies on determining the quantum phase parameters for more complicated QC linear systems for CHT applications.
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Golter, D. Andrew, Genevieve Clark, Tareq El Dandachi, Stefan Krastanov, Matthew Zimmermann, Andrew Greenspon, Noel Wan, et al. "Scalable Control of Spin Quantum Memories in a Photonic Integrated Circuit." In CLEO: QELS_Fundamental Science. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_qels.2022.fth5l.3.

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Using magnetic field gradients and optimally shaped microwave pulses, we demonstrate selective control of color center spin qubits in a diamond micro-chiplet coupled to a photonic integrated circuit, yielding a platform for scalable qubit control.
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Munro, W. J., M. Gong, S. Wang, C. Zha, M. C. Chen, H. L. Huang, Y. Wu, et al. "Strolling through a NISQ processor." In CLEO: QELS_Fundamental Science. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_qels.2022.ff2i.1.

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We demonstrate high fidelity multi-particle quantum walks on an 8x8 two-dimensional square superconducting qubit NISQ processor with 62 functional qubits. Further we implement a Mach-Zehnder interferometer where quantum walkers can coherently traverse the circuit.
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Huber, Florian, Jesse Amato-Grill, Alexei Bylinskii, Sergio H. Cantu, Ming-Guang Hu, Donggyu Kim, Alexander Lukin, Nate Gemelke, and Alexander Keesling. "Cloud-Accessible, Programmable Quantum Simulator Based on Two-Dimensional Neutral Atom Arrays." In Quantum 2.0. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/quantum.2022.qw3a.2.

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Neutral atom arrays recently emerged as one the leading platforms for large-scale quantum computing and simulations [1, 2]. These systems offer a variety of possible qubit encodings with long coherence times along with exceptional programmability and reconfigurability of the array geometry and qubit connectivity. In addition, strong, highly coherent coupling between the qubits can be achieved using Rydberg states of the atoms. QuEra provides a cloud-accessible, programmable 256-qubit quantum simulator based on a two-dimensional array of Rubidium-87 atoms in reconfigurable optical tweezers.
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Kouwenhoven, Leo. "Majorana Qubits." In 2018 IEEE International Electron Devices Meeting (IEDM). IEEE, 2018. http://dx.doi.org/10.1109/iedm.2018.8614592.

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Reports on the topic "Qubits"

1

Martinis, John M., Alexander Korotkov, Frank Wilhelm, and Andrew Cleland. Multi-Qubit Algorithms in Josephson Phase Qubits. Fort Belvoir, VA: Defense Technical Information Center, November 2015. http://dx.doi.org/10.21236/ada631621.

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Maunz, Peter, and Lukas Wilhelm. Trapped Ion Qubits. Office of Scientific and Technical Information (OSTI), April 2017. http://dx.doi.org/10.2172/1365489.

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Luhman, Dwight, Tzu-Ming Lu, Will Hardy, and Leon Maurer. Hole Spin Qubits in Germanium. Office of Scientific and Technical Information (OSTI), September 2018. http://dx.doi.org/10.2172/1475507.

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Mooij, J. E., and C. Harmans. Tools for Persistent-Current Qubits. Fort Belvoir, VA: Defense Technical Information Center, October 2004. http://dx.doi.org/10.21236/ada427479.

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Lukens, James. Superconducting Qubits for Quantum Computation. Fort Belvoir, VA: Defense Technical Information Center, November 2003. http://dx.doi.org/10.21236/ada422633.

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Nori, Franco, S. Savel'ev, F. Marchesoni, B. Y. Zhu, P. Hanggi, Y. Togawa, K. Harada, A. Maeda, A. Tonomura, and A. Rakhmanov. Quantum Computing Using Superconducting Qubits. Fort Belvoir, VA: Defense Technical Information Center, April 2006. http://dx.doi.org/10.21236/ada475358.

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von Winckel, Gregory John. Optimal Design and Control of Qubits. Office of Scientific and Technical Information (OSTI), September 2018. http://dx.doi.org/10.2172/1475100.

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Formaggio, Joseph A. Investigating Natural Radioactivity in Superconducting Qubits. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1602215.

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Saxena, Avadh. Non-Hermitian Qubits and Photonic Lattices. Office of Scientific and Technical Information (OSTI), April 2022. http://dx.doi.org/10.2172/1863733.

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Wachen, John, and Steven McGee. Qubit by Qubit’s Middle School Quantum Camp Evaluation Report for Summer 2021. The Learning Partnership, August 2021. http://dx.doi.org/10.51420/report.2021.5.

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Qubit by Qubit’s Middle School Quantum Camp is one of the first opportunities for students as young as eleven to begin learning about the field of quantum computing. In this week-long summer camp, students learn about key concepts of quantum mechanics and quantum computing, including qubits, superposition, and entanglement, basic coding in Python, and quantum gates. By the end of the camp, students can code quantum circuits and run them on a real quantum computer. The Middle School Quantum Camp substantially increased participants’ knowledge about quantum computing, as exhibited by large gains on a technical assessment that was administered at the beginning and end of the program. On a survey of student motivation, students in the program showed a statistically significant increase in their expectancy of being successful in quantum computing and valuing quantum computing. Students experienced a significant increase in their sense of belonging in STEM and quantum computing following the camp. The camp substantially increased students’ interest in taking additional coursework in STEM and quantum, as well as pursuing careers in STEM and quantum computing.
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