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Academic literature on the topic 'Qubit'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 May 2024

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Journal articles on the topic "Qubit"

1

Moussa, Jonathan Edward. "Quantum circuits for qubit fusion." Quantum Information and Computation 16, no. 13&14 (October 2016): 1113–24. http://dx.doi.org/10.26421/qic16.13-14-3.

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We consider four-dimensional qudits as qubit pairs and their qudit Pauli operators as qubit Clifford operators. This introduces a nesting, C^2_1 belong to C^4_2 belong to C^2_3 , where Cmn is the nth level of the m-dimensional qudit Clifford hierarchy. If we can convert between logical qubits and qudits, then qudit Clifford operators are qubit non-Clifford operators. Conversion is achieved by qubit fusion and qudit fission using stabilizer circuits that consume a resource state. This resource is a fused qubit stabilizer state with a faulttolerant state preparation using stabilizer circuits.

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Nikolaeva, Anstasiia S., Evgeniy O. Kiktenko, and Aleksey K. Fedorov. "Generalized Toffoli Gate Decomposition Using Ququints: Towards Realizing Grover’s Algorithm with Qudits." Entropy 25, no. 2 (February 20, 2023): 387. http://dx.doi.org/10.3390/e25020387.

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Qubits, which are the quantum counterparts of classical bits, are used as basic information units for quantum information processing, whereas underlying physical information carriers, e.g., (artificial) atoms or ions, admit encoding of more complex multilevel states—qudits. Recently, significant attention has been paid to the idea of using qudit encoding as a way for further scaling quantum processors. In this work, we present an efficient decomposition of the generalized Toffoli gate on five-level quantum systems—so-called ququints—that use ququints’ space as the space of two qubits with a joint ancillary state. The basic two-qubit operation we use is a version of the controlled-phase gate. The proposed N-qubit Toffoli gate decomposition has O(N) asymptotic depth and does not use ancillary qubits. We then apply our results for Grover’s algorithm, where we indicate on the sizable advantage of using the qudit-based approach with the proposed decomposition in comparison to the standard qubit case. We expect that our results are applicable for quantum processors based on various physical platforms, such as trapped ions, neutral atoms, protonic systems, superconducting circuits, and others.

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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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DOLL, ROLAND, MARTIJN WUBS, SIGMUND KOHLER, and PETER HÄNGGI. "FIDELITY AND ENTANGLEMENT OF A SPATIALLY EXTENDED LINEAR THREE-QUBIT REGISTER." International Journal of Quantum Information 06, supp01 (July 2008): 681–87. http://dx.doi.org/10.1142/s0219749908003955.

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We study decoherence of a three-qubit array coupled to substrate phonons. Assuming an initial three-qubit entangled state that would be decoherence-free for identical qubit positions, allows us to focus on non-Markovian effects of the inevitable spatial qubit separation. It turns out that the coherence is most affected when the qubits are regularly spaced. Moreover, we find that up to a constant scaling factor, two-qubit entanglement is not influenced by the presence of the third qubit, even though all qubits interact via the phonon field.

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Espinel-López, Cristian, Alvaro Martínez-Gómez, Marisol Aguilar-Echeverría, and Hipatia Mañay-Mañay. "Evolución de componentes de computación cuántica y mediciones cuánticas no destructivas en la informática moderna. //Evolution of quantum computing components and non-destructive quantum measurements in modern computing." CIENCIA UNEMI 11, no. 28 (October 1, 2018): 57–69. http://dx.doi.org/10.29076/issn.2528-7737vol11iss28.2018pp57-69p.

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El presente trabajo, realiza una breve introducción a las medidas QND (Quantum nondemolition measurement) y sus características. Además, se describe teóricamente un qubit acoplado a un oscilador armónico cuántico forzado como ejemplo de una medición QND en un qubit. El formalismo desarrollado para este tipo de sistemas cuánticos acoplados se desenvuelve dentro de la teoría cuántica de la computación. Como parte del estudio de las mediciones QND, se introducen los qubits de flujo que hacen uso de los interferómetros superconductores cuánticos (SQUIDs). El análisis de este esquema informático intenta introducir al lector en los conceptos de computación cuántica como el quibit que es el componente base que permite procesar información de forma cuántica. El objetivo de este trabajo es caracterizar si las medidas elaboradas sobre el qubit acoplado son o no QND. En este sentido, la aplicación del formalismo expuesto permitirá vislumbrar los alcances y limitaciones de los qubits acoplados en el desarrollo y aplicación de los sistemas cuánticos de la computación hasta el día de hoy. Adicionalmente, la aplicación de esta teoría se puede emplear a mediciones QND sobre qubits superconductores articulados a un oscilador armónico cuántico. Todo este proceso es sujeto al análisis y metodología que nos proporciona la historia de la ciencia y la tecnología. AbstractThe present work makes a brief introduction to QND (Quantum non demolition measurement) measurements and its characteristics. In addition, a qubit coupled to a forced quantum harmonic oscillator which is described theoretically as an example of a QND measurement in a qubit. The formalism developed for this type of coupled quantum systems is developed within the quantum theory of computation. As part of the study of QND measurements, the flow qubits making use of quantum superconducting interferometers (SQUIDs) are introduced. The analysis of this computer schema attempts to introduce the reader to the concepts of quantum computing such as qubit, which is the basic component that allows information to be processed quantumly. The objective of this work is to characterize whether the elaborated measures on the coupled qubit are QND or not. In this sense, the application of the exposed formalism will allow us to glimpse the scope and limitations of coupled qubits in the development and application of quantum computing systems to this day. Additionally, the application of this theory can be applied to QND measurements on superconducting qubits coupled to a quantum harmonic oscillator. All this process is subject to the analysis and methodology provided by the history of science and technology.

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Childs, Andrew M., Debbie Leung, Laura Mancinska, and Maris Ozols. "Characterization of universal two-qubit Hamiltonians." Quantum Information and Computation 11, no. 1&2 (January 2011): 19–39. http://dx.doi.org/10.26421/qic11.1-2-3.

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Suppose we can apply a given 2-qubit Hamiltonian H to any (ordered) pair of qubits. We say H is n-universal if it can be used to approximate any unitary operation on n qubits. While it is well known that almost any 2-qubit Hamiltonian is 2-universal, an explicit characterization of the set of non-universal 2-qubit Hamiltonians has been elusive. Our main result is a complete characterization of 2-non-universal 2-qubit Hamiltonians. In particular, there are three ways that a 2-qubit Hamiltonian $H$ can fail to be universal: (1) H shares an eigenvector with the gate that swaps two qubits, (2) H acts on the two qubits independently (in any of a certain family of bases), or (3) H has zero trace (with the third condition relevant only when the global phase of the unitary matters). A 2-non-universal 2-qubit Hamiltonian can still be n-universal for some n \geq 3. We give some partial results on 3-universality.

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Assouline, A., L. Pugliese, H. Chakraborti, Seunghun Lee, L. Bernabeu, M. Jo, K. Watanabe, et al. "Emission and coherent control of Levitons in graphene." Science 382, no. 6676 (December 15, 2023): 1260–64. http://dx.doi.org/10.1126/science.adf9887.

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Flying qubits encode quantum information in propagating modes instead of stationary discrete states. Although photonic flying qubits are available, the weak interaction between photons limits the efficiency of conditional quantum gates. Conversely, electronic flying qubits can use Coulomb interactions, but the weaker quantum coherence in conventional semiconductors has hindered their realization. In this work, we engineered on-demand injection of a single electronic flying qubit state and its manipulation over the Bloch sphere. The flying qubit is a Leviton propagating in quantum Hall edge channels of a high-mobility graphene monolayer. Although single-shot qubit readout and two-qubit operations are still needed for a viable manipulation of flying qubits, the coherent manipulation of an itinerant electronic state at the single-electron level presents a highly promising alternative to conventional qubits.

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Gidney, Craig, Michael Newman, and Matt McEwen. "Benchmarking the Planar Honeycomb Code." Quantum 6 (September 21, 2022): 813. http://dx.doi.org/10.22331/q-2022-09-21-813.

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We improve the planar honeycomb code by describing boundaries that need no additional physical connectivity, and by optimizing the shape of the qubit patch. We then benchmark the code using Monte Carlo sampling to estimate logical error rates and derive metrics including thresholds, lambdas, and teraquop qubit counts. We determine that the planar honeycomb code can create a logical qubit with one-in-a-trillion logical error rates using 7000 physical qubits at a 0.1% gate-level error rate (or 900 physical qubits given native two-qubit parity measurements). Our results cement the honeycomb code as a promising candidate for two-dimensional qubit architectures with sparse connectivity.

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Li, Xiangrong, and Dafa Li. "Rank-based SLOCC classification for odd $n$ qubits." Quantum Information and Computation 11, no. 7&8 (July 2011): 695–705. http://dx.doi.org/10.26421/qic11.7-8-10.

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We study the entanglement classification under stochastic local operations and classical communication (SLOCC) for odd n-qubit pure states. For this purpose, we introduce the rank with respect to qubit i for an odd n-qubit state. The ranks with respect to qubits 1,2, ... n give rise to the classification of the space of odd $n$ qubits into 3^n families.

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PERDRIX, SIMON. "STATE TRANSFER INSTEAD OF TELEPORTATION IN MEASUREMENT-BASED QUANTUM COMPUTATION." International Journal of Quantum Information 03, no. 01 (March 2005): 219–23. http://dx.doi.org/10.1142/s0219749905000785.

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Quantum measurement is universal for quantum computation. The model of quantum computation introduced by Nielsen and further developed by Leung relies on a generalized form of teleportation. In order to simulate any n-qubit unitary transformation with this model, four auxiliary qubits are required. Moreover Leung exhibited a universal family of observables composed of one one-qubit measurement and four two-qubit measurements. We introduce a model of quantum computation via measurements only, relying on state transfer: state transfer only retains the part of teleportation which is necessary for computation. In order to simulate any n-qubit unitary transformation with this new model, only one auxiliary qubit is required. Moreover we exhibit a universal family of observables composed of three one-qubit measurements and only one two-qubit measurement. This model improves those of Nielsen and Leung in terms of both the number of auxiliary qubits and the number of two-qubit measurements required for quantum universality. In both cases, the minimal amounts of necessary resources are now reached: one auxiliary qubit (because measurement is destructive) and one two-qubit measurement (for creating entanglement).

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Dissertations / Theses on the topic "Qubit"

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Nasser, Metwally Aly Mohamed. "Entangled qubit pairs." Diss., [S.l.] : [s.n.], 2002. http://edoc.ub.uni-muenchen.de/archive/00000083.

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Fay, Aurélien. "Couplage variable entre un qubit de charge et un qubit de phase." Phd thesis, Université Joseph Fourier (Grenoble), 2008. http://tel.archives-ouvertes.fr/tel-00310131.

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Nous avons étudié la dynamique quantique d'un circuit supraconducteur constitué d'un SQUID dc couplé à un transistor à paires de Cooper fortement asymétrique (ACPT). Le SQUID dc est un qubit de phase contrôlé par un courant de polarisation et un champ magnétique. L'ACPT est un qubit de charge contrôlé par un courant de polarisation, un champ magnétique et une tension de la grille.

Nous avons mesuré par spectroscopie micro-onde les premiers niveaux d'énergie du circuit couplé en fonction des paramètres de contrôle. Les mesures des états quantiques des qubits de charge et de phase sont réalisées par une mesure d'échappement du SQUID dc avec une impulsion de flux nanoseconde appliquée dans celui-ci. La mesure de l'ACPT utilise un nouveau processus quantique : l'état excité de l'ACPT est transféré adiabatiquement vers l'état excité du SQUID durant l'impulsion de flux.

Notre circuit permet de manipuler indépendamment chaque qubit tout comme il permet d'intriquer les états quantiques des deux circuits. Nous avons observé des anti-croisements des niveaux d'énergie des deux qubits lorsqu'ils sont mis en résonance. Le couplage a été mesuré sur une large gamme de fréquence, pouvant varier de 60 MHz à 1.1 GHz. Nous avons réussi à obtenir un couplage variable entre le qubit de charge et le qubit de phase. Nous avons analysé théoriquement la dynamique quantique de notre circuit. Cette analyse a permis de bien expliquer le couplage variable mesuré par une combinaison entre un couplage Josephson et un couplage capacitif entre les deux qubits.

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Fay, Aurélien. "Couplage variable entre un qubit de charge et un qubit de phase." Phd thesis, Grenoble 1, 2008. http://www.theses.fr/2008GRE10071.

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Nous avons étudié la dynamique quantique d'un circuit supraconducteur constitué d'un SQUID dc couplé à un transistor à paires de Cooper fortement asymétrique (ACPT). Le SQUID dc est un qubit de phase contrôlé par un courant de polarisation et un champ magnétique. L'ACPT est un qubit de charge contrôlé par un courant de polarisation, un champ magnétique et une tension de la grille. Nous avons mesuré par spectroscopie micro-onde les premiers niveaux d'énergie du circuit couplé en fonction des paramètres de contrôle. Les mesures des états quantiques des qubits de charge et de phase sont réalisées par une mesure d'échappement du SQUID dc avec une impulsion de flux nanoseconde appliquée dans celui-ci. La mesure de l'ACPT utilise un nouveau processus quantique : l'état excité de l'ACPT est transféré adiabatiquement vers l'état excité du SQUID durant l'impulsion de flux. Notre circuit permet de manipuler indépendamment chaque qubit tout comme il permet d'intriquer les états quantiques des deux circuits. Nous avons observé des anti-croisements des niveaux d'énergie des deux qubits lorsqu'ils sont mis en résonance. Le couplage a été mesuré sur une large gamme de fréquence, pouvant varier de 60 MHz à 1. 1 GHz. Nous avons réussi à obtenir un couplage variable entre le qubit de charge et le qubit de phase. Nous avons analysé théoriquement la dynamique quantique de notre circuit. Cette analyse a permis de bien expliquer le couplage variable mesuré par une combinaison entre un couplage Josephson et un couplage capacitif entre les deux qubits
We have studied the quantum dynamics of a superconducting circuit based on a dc-SQUID coupled to a highly asymmetric Cooper pair transistor (ACPT). The dc-SQUID is a phase qubit controlled by a bias current and magnetic field. The ACPT is a charge qubit controlled by a bias current, magnetic flux and gate voltage. We have measured by microwave spectroscopy the lowest quantum levels of the coupled circuit as a function of the bias parameters. Quantum state measurements of the phase and charge qubit are achieved by an escape measurement on the dc SQUID with a nanosecond flux pulse applied to it. The measurement of the ACPT state consist of a new quantum process: the excited state of the ACPT is adiabatically transferred to the excited state of the SQUID during the flux pulse. Our circuit enables the independent manipulation of each qubit as well as the entanglement of the quantum states of the two circuits. We observe avoided level crossings between the two qubits when they are put in resonance. The coupling strength is measured over a large frequency range and varies from 60 MHz to 1. 1 GHz. In this coupled circuit, we succeed to realize a tunable coupling between the charge and the phase qubit. We have analyzed theoretically the quantum dynamics of our circuit. This analysis explains well the measured tunable coupling strength by a combination of a capacitive and a Josephson coupling between the two qubits

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Palomaki, Tauno A. "Dc SQUID phase qubit." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8575.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.
Thesis research directed by: Dept. of 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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Viehmann, Oliver. "Multi-qubit circuit quantum electrodynamics." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-160998.

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Aiello, Clarice Demarchi. "Qubit dynamics under alternating controls." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/93053.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 111-117).
In this thesis, we discuss two problems of quantum dynamics in the presence of alternating controls. Alternating controls arise in many protocols designed to extend the duration over which a qubit is a useful computational resource. This is accomplished by control sequences that either retard decoherence, or that accomplish a quantum operation in as short a time as possible. The first problem tackles the use of a composite-pulse control sequence known as 'rotary-echo' for quantum magnetometry purposes. The sequence consists in the continuous drive of a qubit, with field phases that alternate at specific intervals. We implement such a magnetometry protocol using an electronic qubit in diamond, and experimentally confirm the flexibility yielded by the tuning of sequence parameters that achieves a good compromise between decoherence resilience and sensitivity. The second problem theoretically investigates the time-optimal evolution of a qubit in the case of a restricted control set composed of alternating rotations around two non-parallel axes on the Bloch sphere. Using accessible algebraic methods, we show that experimental parameters, such as the angle between the two rotation axes, restrict the necessary structure of time-optimal sequences. We propose to implement such an evolution through alternate driving as an advantageous alternative to the slow, noisy direct addressing of a nuclear qubit anisotropically hyperfine-coupled to an electronic spin in diamond.
by Clarice Demarchi Aiello.
Ph. D.

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7

Convertini, Luciana. "Simulazione numerica di qubit a superconduttori di tipo transmon: dal layout al gate a singolo qubit." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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In questo lavoro di tesi è stato messo a punto un insieme di modelli e strumenti di simulazione numerica che consentono nel loro insieme l’analisi completa di un sistema formato da qubit a superconduttore di tipo transmon per il calcolo quantistico. Appoggiandosi agli elementi noti della teoria del transmon, l’analisi parte dalla definizione del layout da cui, mediante simulazioni elettromagnetiche, si estraggono le matrici di capacità ed induttanza dei vari componenti. Questo consente la costruzione dell’Hamiltoniano del sistema, noto il quale si possono eseguire le simulazioni nel dominio del tempo delle operazioni dei vari gate, una volta definiti gli opportuni segnali di controllo. Per l’implementazione del flusso di simulazione si sono utilizzati sia strumenti software open-source (Qiskit Metal, FastCap, QuTip), sia script Python sviluppati allo scopo. A dimostrazione della funzionalità dell’ambiente così creato viene presentata l’analisi di un transmon accoppiato a risonatori e linee di trasmissione, tramite il quale si realizza un quantum gate a singolo qubit di tipo X.

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Narla, Anirudh. "Flying Qubit Operations in Superconducting Circuits." Thesis, Yale University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10783459.

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The quantum non-demolition (QND) measurement process begins by entangling the system to be measured, a qubit for example, with an ancillary degree of freedom, usually a system with an infinite-dimensional Hilbert space. The ancilla is amplified to convert the quantum signal into a measurable classical signal. The continuous classical signal is recorded by a measurement apparatus; a discrete measurement outcome is recovered by thresholding the integrated signal record. Measurements play a central role in technologies based on quantum theory, like quantum computation and communication. They form the basis for a wide range of operations, ranging from state initialization to quantum error correction. Quantum measurements used for quantum computation must satisfy three essential requirements of being high fidelity, quantum non-demolition and efficient. Satisfying these criteria necessitates control over all the parts of the quantum measurement process, especially generating the ancilla, entangling it with the qubit and amplifying it to complete the measurement.

For superconducting quantum circuits, a promising platform for realizing quantum computation, a natural choice for the ancillae are modes of microwave-frequency electromagnetic radiation. In the paradigm of circuit quantum electrodynamics (cQED) with three-dimensional circuits, the most commonly used ancillae are coherent states, since they are easy to generate, process and amplify. Using these flying coherent states, we present results for achieving QND measurements of transmon qubits with fidelities of F> 0.99 and efficiencies of η = 0.56 ± 0.01. By also treating the measurement as a more general quantum operation, we use the ancillae as carriers of quantum information to generate remote entanglement between two transmon qubits in separate cavities. By using microwave single photons as the flying qubits, it is possible to generate remote entanglement that is robust to loss since the generation of entanglement is uniquely linked to a particular measurement outcome. We demonstrate, in a single experiment, the ability to efficiently generate and detect single microwave photons and use them to generate robust remote entanglement between two transmon qubits. This operation forms a crucial primitive in modular architectures for quantum computation. The results of this thesis extend the experimental toolbox at the disposal to superconducting circuits. Building on these results, we outline proposals for remote entanglement distillation as well as strategies to further improve the performance of the various tools.

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Weber, Steven Joseph. "Quantum Trajectories of a Superconducting Qubit." Thesis, University of California, Berkeley, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3686046.

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In quantum mechanics, the process of measurement is intrinsically probabilistic. As a result, continuously monitoring a quantum system will randomly perturb its natural unitary evolution. An accurate measurement record documents this stochastic evolution and can be used to reconstruct the quantum trajectory of the system state in a single experimental iteration. We use weak measurements to track the individual quantum trajectories of a superconducting qubit that evolves under the competing influences of continuous weak measurement and Rabi drive. We analyze large ensembles of such trajectories to examine their characteristics and determine their statistical properties. For example, by considering only the subset of trajectories that evolve between any chosen initial and final states, we can deduce the most probable path through quantum state space. Our investigation reveals the rich interplay between measurement dynamics, typically associated with wavefunction collapse, and unitary evolution. Our results provide insight into the dynamics of open quantum systems and may enable new methods of quantum state tomography, quantum state steering through measurement, and active quantum control.

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Bader, Samuel James. "Higher levels of the transmon qubit." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92701.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 91-95).
This thesis discusses recent experimental work in measuring the properties of higher levels in transmon qubit systems. The first part includes a thorough overview of transmon devices, explaining the principles of the device design, the transmon Hamiltonian, and general Circuit Quantum Electrodynamics concepts and methodology. The second part discusses the experimental setup and methods employed in measuring the higher levels of these systems, and the details of the simulation used to explain and predict the properties of these levels.
by Samuel James Bader.
S.B.

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Books on the topic "Qubit"

1

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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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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Dal bit al qubit: Elementi di teoria dell'informazione classica e quantistica. Roma: Aracne, 2009.

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illustrator, Cartwright Amy, ed. Quit it! Mankato, Minnesota: Amicus Readers, 2015.

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Never quit. [Jacksonville, Florida]: Triplicity Publishing, LLC, 2016.

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Rainger, Amanda. Quit sait? London: BBC Educational, 1993.

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Quit it. New York, NY: Delacorte Press, 2002.

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The quit. New York: Simon & Schuster, 1996.

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Byalick, Marcia. Quit It. New York: Random House Children's Books, 2009.

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Quit smoking. New Lanark, Scotland: Geddes & Grosset, 2007.

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Book chapters on the topic "Qubit"

1

Diósi, Lajos. "Qubit Thermodynamics." In A Short Course in Quantum Information Theory, 123–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-16117-9_12.

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Kasirajan, Venkateswaran. "Qubit Modalities." In Fundamentals of Quantum Computing, 107–47. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63689-0_4.

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Fujii, Yoichi Robertus. "MicroRNA Qubit." In The MicroRNA Quantum Code Book, 11–16. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8586-7_2.

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Conti, Claudio. "Qubit Maps." In Quantum Science and Technology, 51–83. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-44226-1_3.

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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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McCracken, James M. "Negative Qubit Channel Examples with Multi-Qubit Baths." In Negative Quantum Channels, 107–13. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-031-02517-4_11.

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Diósi, Lajos. "One-Qubit Manipulations." In A Short Course in Quantum Information Theory, 47–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-16117-9_6.

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Briggs, Andrew, Martin P. Weides, Michael R. Vissers, Jeffrey S. Kline, Martin O. Sandberg, David P. Pappas, Joshua Veazey, et al. "Nanosession: Qubit Systems." In Frontiers in Electronic Materials, 357–66. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527667703.ch55.

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D’Ariano, Giacomo Mauro. "It from Qubit." In The Frontiers Collection, 25–35. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-12946-4_3.

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Ballance, Christopher J. "Single-Qubit Gates." In Springer Theses, 87–96. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68216-7_7.

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Conference papers on the topic "Qubit"

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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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You, J. Q., Xuedong Hu, S. Ashhab, and Franco Nori. "Low-decoherence flux qubit." In Workshop on Entanglement and Quantum Decoherence. Washington, D.C.: Optica Publishing Group, 2008. http://dx.doi.org/10.1364/weqd.2008.sss3.

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A flux qubit can have a relatively long decoherence time at the degeneracy point, but away from this point the decoherence time is greatly reduced by dephasing. This limits the practical applications of flux qubits. Here we propose a new qubit design modified from the commonly used flux qubit by introducing an additional capacitor shunted in parallel to the smaller Josephson junction (JJ) in the loop. Our results show that the effects of noise can be considerably suppressed, particularly away from the degeneracy point, by both reducing the coupling energy of the JJ and increasing the shunt capacitance. This shunt capacitance provides a novel way to improve the qubit.

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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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Wang, Mingxuan, and David van Zanten. "Novel Fast Qubit Readout Approaches Enabled By Qubit Cloaking." In Novel Fast Qubit Readout Approaches Enabled By Qubit Cloaking. US DOE, 2023. http://dx.doi.org/10.2172/1998930.

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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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Johansson, J. R., S. Ashhab, A. M. Zagoskin, and F. Nori. "Dynamics of a superconducting qubit coupled to quantum two-level systems in its environment." In Workshop on Entanglement and Quantum Decoherence. Washington, D.C.: Optica Publishing Group, 2008. http://dx.doi.org/10.1364/weqd.2008.qia3.

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We study the decoherence dynamics of a superconducting qubit coupled to a quantum two-level system (TLS) in addition to its weak coupling to a background environment [1]. We identify two weak-coupling regimes, which differ by the relation between qubit and TLS decoherence times, and a strong coupling regime. We find expressions for the qubit decoherence rates in the weak-coupling regimes. For a weakly coupled and strongly dissipative TLS we find that the qubit dynamics is markovian, whereas for a weakly dissipative TLS the qubit dynamics shows non-markovian behavior. In the strong-coupling regime we study the driven qubit dynamics and we analyze the differences from standard Rabi-oscillations due to the coupling to the quantum TLS [2]. In doing so we identify signatures in the qubit dynamics that can be used to characterize the TLS. We also investigate the possibility of using environmental TLSs with long coherence times for quantum information processing [3]. By using the Josephson junction as a bus and the TLSs in the environment as qubits, we demonstrate that initialization, a universal set of quantum gates, and read-out of the TLSs can be implemented, even though the TLSs themselves cannot be directly accessed.

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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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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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Iuliano, Mariagrazia, Marie-Christine Roehsner, Nir Alifasi, Tanmoy Chakraborty, Arian J. Stolk, Matthew J. Weaver, Mariya O. Sholkina, et al. "Interfacing an NV-center in diamond and a rare-earth ion compatible photonic time-bin qubit." In Quantum 2.0. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/quantum.2023.qw4a.7.

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We present a quantum interface connecting a solid-state network node to photonic qubits compatible with rare-earth ion quantum memories. We demonstrate two-photon quantum interference and discuss teleportation of a photonic qubit into the network node.

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Reports on the topic "Qubit"

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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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Davis, J. C. STM Studies of Semiconductor Qubit Candidates. Fort Belvoir, VA: Defense Technical Information Center, November 2005. http://dx.doi.org/10.21236/ada455573.

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Shreeram, Soumya. Studying Qubit Interactions with Multimode Cavities Using QuTiP. Office of Scientific and Technical Information (OSTI), September 2019. http://dx.doi.org/10.2172/1615359.

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Saxena, Avadh, and Julia Cen. Anti-PT-symmetric qubit: Decoherence and Entanglement Entropy. Office of Scientific and Technical Information (OSTI), August 2020. http://dx.doi.org/10.2172/1647202.

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Nielsen, Erik. Efficient Scalable Tomography of Many-Qubit Quantum Processors. Office of Scientific and Technical Information (OSTI), September 2020. http://dx.doi.org/10.2172/1673168.

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Blume-Kohout, Robin, Erik Nielsen, Kenneth Rudinger, Mohan Sarovar, and Kevin Young. Efficient Predictive Tomography of Multi-Qubit Quantum Processors. Office of Scientific and Technical Information (OSTI), November 2017. http://dx.doi.org/10.2172/1733288.

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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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Harris, Charles Thomas, Tzu-Ming Lu, Andrew Jacob Miller, Donald Thomas Bethke, and Rupert M. Lewis. Towards Quantum-Limited Cryogenic Amplification for Multi-Qubit Platforms. Office of Scientific and Technical Information (OSTI), September 2019. http://dx.doi.org/10.2172/1569518.

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Khatiwada, Rakshya. Qubit Based Single Photon Sensors for Dark Matter Searches. Office of Scientific and Technical Information (OSTI), January 2019. http://dx.doi.org/10.2172/1592131.

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Friesen, Mark, and Xuedong Hu. Exploiting Many-Body Bus States for Multi-Qubit Entanglement. Fort Belvoir, VA: Defense Technical Information Center, June 2013. http://dx.doi.org/10.21236/ada594989.

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