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Journal articles on the topic 'Solid state qubit'

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Author: Grafiati

Published: 4 June 2021

Last updated: 29 January 2023

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1

Чуйкин, О. А., Я. С. Гринберг, and А. А. Штыгашев. "Затухание вакуумных осцилляций Раби в двухкубитной структуре в высокодобротном резонаторе." Физика твердого тела 62, no. 9 (2020): 1407. http://dx.doi.org/10.21883/ftt.2020.09.49762.13h.

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In this work, we study the damping of vacuum Rabi oscillations for a system of two superconducting solid-state qubits placed in a high-quality microwave resonator. Two different cases are considered: the first qubit is excited at the initial moment, and the initial state is an entangled symmetric and antisymmetric pair. The dependence of the damping on various parameters, primarily on the photon-qubit coupling and on the distance between qubits, is studied in detail. It is shown that for some parameters, the relaxation time of the excited qubit is significantly longer than that for a single qubit in the cavity.

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2

Miao, Kevin C., Joseph P. Blanton, Christopher P. Anderson, Alexandre Bourassa, Alexander L. Crook, Gary Wolfowicz, Hiroshi Abe, Takeshi Ohshima, and David D. Awschalom. "Universal coherence protection in a solid-state spin qubit." Science 369, no. 6510 (August 13, 2020): 1493–97. http://dx.doi.org/10.1126/science.abc5186.

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Decoherence limits the physical realization of qubits, and its mitigation is critical for the development of quantum science and technology. We construct a robust qubit embedded in a decoherence-protected subspace, obtained by applying microwave dressing to a clock transition of the ground-state electron spin of a silicon carbide divacancy defect. The qubit is universally protected from magnetic, electric, and temperature fluctuations, which account for nearly all relevant decoherence channels in the solid state. This culminates in an increase of the qubit’s inhomogeneous dephasing time by more than four orders of magnitude (to >22 milliseconds), while its Hahn-echo coherence time approaches 64 milliseconds. Requiring few key platform-independent components, this result suggests that substantial coherence improvements can be achieved in a wide selection of quantum architectures.

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3

Yuan, Tingting, Fang Zhou, Shengping Chen, Shaohua Xiang, Kehui Song, and Yujing Zhao. "Multipurpose Quantum Simulator Based on a Hybrid Solid-State Quantum Device." Symmetry 11, no. 4 (April 2, 2019): 467. http://dx.doi.org/10.3390/sym11040467.

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This paper proposes a scheme to enhance the fidelity of symmetric and asymmetric quantum cloning using a hybrid system based on nitrogen-vacancy (N-V) centers. By setting different initial states, the present scheme can implement optimal symmetric (asymmetric) universal (phase-covariant) quantum cloning, so that the copies with the assistance of a Current-biased Josephson junction (CBJJ) qubit and four transmission-line resonators (TLRs) can be obtained. The scheme consists of two stages: cjhothe first stage is the implementation of the conventional controlled-phase gate, and the second is the realization of different quantum cloning machines (QCM) by choosing a suitable evolution time. The results show that the probability of success for QCM of a copy of the equatorial state can reach 1. Furthermore, the | W 4 ± ⟩ entangled state can be generated in the process of the phase-covariant quantum anti-cloning. Finally, the decoherence effects caused by the N-V center qubits and CBJJ qubit are discussed.

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4

Kumar, Preethika, and Steven R. Skinner. "Universal quantum computing in linear nearest neighbor architectures." Quantum Information and Computation 11, no. 3&4 (March 2011): 300–312. http://dx.doi.org/10.26421/qic11.3-4-8.

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We introduce a scheme for realizing universal quantum computing in a linear nearest neighbor architecture with fixed couplings. We first show how to realize a controlled-NOT gate operation between two adjacent qubits without having to isolate the two qubits from qubits adjacent to them. The gate operation is implemented by applying two consecutive pulses of equal duration, but varying amplitudes, on the target qubit. Since only a single control parameter is required in implementing our scheme, it is very efficient. We next show how our scheme can be used to realize single qubit rotations and two-qubit controlled-unitary operations. As most proposals for solid state implementations of a quantum computer use a one-dimensional line of qubits, the schemes presented here will be extremely useful.

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5

Bienfait, A., K. J. Satzinger, Y. P. Zhong, H. S. Chang, M. H. Chou, C. R. Conner, É. Dumur, et al. "Phonon-mediated quantum state transfer and remote qubit entanglement." Science 364, no. 6438 (April 25, 2019): 368–71. http://dx.doi.org/10.1126/science.aaw8415.

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Phonons, and in particular surface acoustic wave phonons, have been proposed as a means to coherently couple distant solid-state quantum systems. Individual phonons in a resonant structure can be controlled and detected by superconducting qubits, enabling the coherent generation and measurement of complex stationary phonon states. We report the deterministic emission and capture of itinerant surface acoustic wave phonons, enabling the quantum entanglement of two superconducting qubits. Using a 2-millimeter-long acoustic quantum communication channel, equivalent to a 500-nanosecond delay line, we demonstrate the emission and recapture of a phonon by one superconducting qubit, quantum state transfer between two superconducting qubits with a 67% efficiency, and, by partial transfer of a phonon, generation of an entangled Bell pair with a fidelity of 84%.

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6

Markiewicz, Marcin, and Marcin Wieśniak. "One-Qubit and Two-Qubit Codes in Noisy State Transfer." Open Systems & Information Dynamics 17, no. 02 (June 2010): 121–33. http://dx.doi.org/10.1142/s1230161210000096.

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Quantum state transfer is a procedure, which allows to exchange quantum information between stationary qubit systems. It is anticipated that the transfer will find applications in solid-state quantum computing. In this contribution, we discuss the effects of various, physically relevant models of decoherence on a toy model of six qubit linearly coupled by the exchange interaction. In many cases we observe the advantage of the two-qubit encoding, which can be associated with the fact that this encoding does not require the state initialization.

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7

Chen, Shixian, Xiaojie Li, Kaixuan Wu, and Jiadong Shi. "Quantum coherence in a superconducting circuit coupled with a dissipative cavity field." Laser Physics Letters 19, no. 10 (August 18, 2022): 105202. http://dx.doi.org/10.1088/1612-202x/ac867a.

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Abstract Quantum coherence represents a basic feature of a quantum system that is not present in the classical world. Here, we explore the dynamic behaviors of quantum coherence in two charge qubits who are strongly coupled with a single-mode dissipative cavity field. The results show that quantum coherence is sensitive to the coupled system parameters including qubit dissipation rate, initial qubit distribution angle, and coherent state intensity of the cavity field. Additionally, during the dynamic evolution, quantum coherence behaves periodically in the case of the qubit distribution angle, and this periodicity depends on the qubit dissipation rate. Also, the increasing coherent state intensity of cavity field can enhance the magnitude of quantum coherence, meaning that coherence resource in dissipative solid state quantum system can be controlled to some extent. This controllable coherence resource in engineering applications may quantify the advantage enabled in the superconducting circuit for processing the remarkable quantum information tasks.

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8

Dzurak, A. S., M. Y. Simmons, A. R. Hamilton, R. G. Clark, R. Brenner, T. M. Buehler, N. J. Curson, et al. "Construction of a silicon-based solid state quantum computer." Quantum Information and Computation 1, Special (December 2001): 82–95. http://dx.doi.org/10.26421/qic1.s-8.

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We discuss progress towards the fabrication and demonstration of a prototype silicon-based quantum computer. The devices are based on a precise array of 31P dopants embedded in 28Si. Fabrication is being pursued via two complementary pathways – a ‘top-down’ approach for near-term production of few-qubit demonstration devices and a ‘bottom-up’ approach for large-scale qubit arrays. The ‘top-down’ approach employs ion implantation through a multi-layer resist structure which serves to accurately register the donors to metal control gates and single-electron transistor (SET) read-out devices. In contrast the ‘bottom-up’ approach uses STM lithography and epitaxial silicon overgrowth to construct devices at an atomic scale. Techniques for qubit read-out, which utilise coincidence measurements on novel twin-SET devices, are also presented.

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9

Fang, Yang De. "Decoherence of Flux Qubits under Sub-Ohmic Bath." Advanced Materials Research 710 (June 2013): 315–19. http://dx.doi.org/10.4028/www.scientific.net/amr.710.315.

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In two-level approximation, we investigate the influence of mutual inductive coupling in superconducting quantum circuits on the decoherence of flux qubits under sub-Ohmic thermal bath environment by utilizing Bloch-Redfield function. The investigation results show: (1) The memory effect existing in the solid-state environment is beneficial to prolong the decoherence time of the superconducting flux qubit, building sub-Ohmic thermal bath environments can improve the decoherence of the solid-state qubit. (2) When the quantum system and the thermal bath are in weak coupling, generally speaking, the mutual coupling effect between circuit elements will destroy the quantum coherence; but when the quantum system and the thermal bath are in strong coupling, it will help to enhance the decoherence time by controlling the mutual inductive coupling between the loop components.

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10

Cuccoli, Alessandro, Davide Nuzzi, Ruggero Vaia, and Paola Verrucchi. "Using solitons for manipulating qubits." International Journal of Quantum Information 12, no. 02 (March 2014): 1461013. http://dx.doi.org/10.1142/s0219749914610139.

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Many proposals for quantum devices are based on qubits that are physically realized by the spin magnetic moment of some quantum object. In this case, one of the most often adopted strategies for manipulating qubits is that of using external magnetic fields. However, selectively applying a field just to one qubit may be a practically unattainable goal, as it is, for instance, in most solid-state based setups. In this work, we present a proposal for using nonlinear excitations of solitonic type to accomplish the above task. Our scheme entails the generation of a dynamical soliton in a classical spin-chain which is locally coupled with one qubit: as the soliton runs through, the qubit behaves, due to its interaction with the chain, as if it were subject to a magnetic field with a time dependence that follows from the soliton's features. We here present results for the time evolution of the qubit density-matrix induced by the overall dynamics of the above scheme.

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11

Yamamoto, Michihisa, Shintaro Takada, Christopher Bäuerle, Kenta Watanabe, Andreas D. Wieck, and Seigo Tarucha. "Electrical control of a solid-state flying qubit." Nature Nanotechnology 7, no. 4 (March 18, 2012): 247–51. http://dx.doi.org/10.1038/nnano.2012.28.

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12

Paladino, E., A. D’Arrigo, A. Mastellone, and G. Falci. "Relaxation processes in solid-state two-qubit gates." Physica E: Low-dimensional Systems and Nanostructures 42, no. 3 (January 2010): 439–43. http://dx.doi.org/10.1016/j.physe.2009.06.042.

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13

Ralph, J. F., T. D. Clark, M. J. Everitt, H. Prance, P. Stiffell, and R. J. Prance. "Characterising a solid state qubit via environmental noise." Physics Letters A 317, no. 3-4 (October 2003): 199–205. http://dx.doi.org/10.1016/j.physleta.2003.08.061.

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14

Zhou, Xianjing, Gerwin Koolstra, Xufeng Zhang, Ge Yang, Xu Han, Brennan Dizdar, Xinhao Li, et al. "Single electrons on solid neon as a solid-state qubit platform." Nature 605, no. 7908 (May 4, 2022): 46–50. http://dx.doi.org/10.1038/s41586-022-04539-x.

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15

Pompili, M., S. L. N. Hermans, S. Baier, H. K. C. Beukers, P. C. Humphreys, R. N. Schouten, R. F. L. Vermeulen, et al. "Realization of a multinode quantum network of remote solid-state qubits." Science 372, no. 6539 (April 15, 2021): 259–64. http://dx.doi.org/10.1126/science.abg1919.

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The distribution of entangled states across the nodes of a future quantum internet will unlock fundamentally new technologies. Here, we report on the realization of a three-node entanglement-based quantum network. We combine remote quantum nodes based on diamond communication qubits into a scalable phase-stabilized architecture, supplemented with a robust memory qubit and local quantum logic. In addition, we achieve real-time communication and feed-forward gate operations across the network. We demonstrate two quantum network protocols without postselection: the distribution of genuine multipartite entangled states across the three nodes and entanglement swapping through an intermediary node. Our work establishes a key platform for exploring, testing, and developing multinode quantum network protocols and a quantum network control stack.

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16

Scappucci, G., P. J. Taylor, J. R. Williams, T. Ginley, and S. Law. "Crystalline materials for quantum computing: Semiconductor heterostructures and topological insulators exemplars." MRS Bulletin 46, no. 7 (July 2021): 596–606. http://dx.doi.org/10.1557/s43577-021-00147-8.

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AbstractHigh-purity crystalline solid-state materials play an essential role in various technologies for quantum information processing, from qubits based on spins to topological states. New and improved crystalline materials emerge each year and continue to drive new results in experimental quantum science. This article summarizes the opportunities for a selected class of crystalline materials for qubit technologies based on spins and topological states and the challenges associated with their fabrication. We start by describing semiconductor heterostructures for spin qubits in gate-defined quantum dots and benchmark GaAs, Si, and Ge, the three platforms that demonstrated two-qubit logic. We then examine novel topologically nontrivial materials and structures that might be incorporated into superconducting devices to create topological qubits. We review topological insulator thin films and move onto topological crystalline materials, such as PbSnTe, and its integration with Josephson junctions. We discuss advances in novel and specialized fabrication and characterization techniques to enable these. We conclude by identifying the most promising directions where advances in these material systems will enable progress in qubit technology.

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17

Zhang, Qin, Rusko Ruskov, and Alexander N. Korotkov. "Non-ideal quantum feedback of a solid-state qubit." Journal of Physics: Conference Series 38 (May 10, 2006): 163–66. http://dx.doi.org/10.1088/1742-6596/38/1/039.

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18

Leek, P. J., J. M. Fink, A. Blais, R. Bianchetti, M. Goppl, J. M. Gambetta, D. I. Schuster, L. Frunzio, R. J. Schoelkopf, and A. Wallraff. "Observation of Berry's Phase in a Solid-State Qubit." Science 318, no. 5858 (December 21, 2007): 1889–92. http://dx.doi.org/10.1126/science.1149858.

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19

Huerga, Daniel. "Variational Quantum Simulation of Valence-Bond Solids." Quantum 6 (December 13, 2022): 874. http://dx.doi.org/10.22331/q-2022-12-13-874.

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We introduce a hybrid quantum-classical variational algorithm to simulate ground-state phase diagrams of frustrated quantum spin models in the thermodynamic limit. The method is based on a cluster-Gutzwiller ansatz where the wave function of the cluster is provided by a parameterized quantum circuit whose key ingredient is a two-qubit real XY gate allowing to efficiently generate valence-bonds on nearest-neighbor qubits. Additional tunable single-qubit Z- and two-qubit ZZ-rotation gates allow the description of magnetically ordered and paramagnetic phases while restricting the variational optimization to the U(1) subspace. We benchmark the method against the J1−J2 Heisenberg model on the square lattice and uncover its phase diagram, which hosts long-range ordered Neel and columnar anti-ferromagnetic phases, as well as an intermediate valence-bond solid phase characterized by a periodic pattern of 2×2 strongly-correlated plaquettes. Our results show that the convergence of the algorithm is guided by the onset of long-range order, opening a promising route to synthetically realize frustrated quantum magnets and their quantum phase transition to paramagnetic valence-bond solids with currently developed superconducting circuit devices.

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20

Petrosyan, D., and G. Kurizki. "Quantum computer with dipole-dipole interacting two-level systems." Quantum Information and Computation 6, no. 1 (January 2006): 1–15. http://dx.doi.org/10.26421/qic6.1-1.

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A scalable, high-performance quantum processor can be implemented using near-resonant dipole-dipole interacting dopants in a transparent solid state host. In this scheme, the qubits are represented by ground and subradiant states of effective dimers formed by pairs of closely spaced two-level systems, while the two-qubit entanglement either relies on the coherent excitation exchange between the dimers or is mediated by external laser fields.

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21

Takeda, Kenta, Jun Kamioka, Tomohiro Otsuka, Jun Yoneda, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, et al. "A fault-tolerant addressable spin qubit in a natural silicon quantum dot." Science Advances 2, no. 8 (August 2016): e1600694. http://dx.doi.org/10.1126/sciadv.1600694.

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Fault-tolerant quantum computing requires high-fidelity qubits. This has been achieved in various solid-state systems, including isotopically purified silicon, but is yet to be accomplished in industry-standard natural (unpurified) silicon, mainly as a result of the dephasing caused by residual nuclear spins. This high fidelity can be achieved by speeding up the qubit operation and/or prolonging the dephasing time, that is, increasing the Rabi oscillation quality factor Q (the Rabi oscillation decay time divided by the π rotation time). In isotopically purified silicon quantum dots, only the second approach has been used, leaving the qubit operation slow. We apply the first approach to demonstrate an addressable fault-tolerant qubit using a natural silicon double quantum dot with a micromagnet that is optimally designed for fast spin control. This optimized design allows access to Rabi frequencies up to 35 MHz, which is two orders of magnitude greater than that achieved in previous studies. We find the optimum Q = 140 in such high-frequency range at a Rabi frequency of 10 MHz. This leads to a qubit fidelity of 99.6% measured via randomized benchmarking, which is the highest reported for natural silicon qubits and comparable to that obtained in isotopically purified silicon quantum dot–based qubits. This result can inspire contributions to quantum computing from industrial communities.

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22

D'Arrigo, A., G. Falci, and E. Paladino. "Dynamical decoupling of random telegraph noise in a two-qubit gate." International Journal of Quantum Information 12, no. 02 (March 2014): 1461008. http://dx.doi.org/10.1142/s0219749914610085.

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Controlling the dynamics of entanglement and preventing its disappearance are central requisites for any implementation of quantum information processing. Solid state qubits are frequently affected by random telegraph noise due to bistable impurities of different nature coupled to the device. In this paper, we investigate the possibility to achieve an efficient universal two-qubit gate in the presence of random telegraph noise by periodic dynamical decoupling. We find an analytic form of the gate error as a function of the number of applied pulses valid when the gate time is much shorter then the telegraphic process correlation time. The analysis is further supplemented by exact numerical results demonstrating the feasibility of a highly-efficient universal two-qubit gate.

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23

Ruskuc, Andrei, Chun-Ju Wu, Jake Rochman, Joonhee Choi, and Andrei Faraon. "Nuclear spin-wave quantum register for a solid-state qubit." Nature 602, no. 7897 (February 16, 2022): 408–13. http://dx.doi.org/10.1038/s41586-021-04293-6.

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24

Luo, Jun Yan, Hujun Jiao, Feng Li, Xin-Qi Li, and Yi Jing Yan. "Reduced dynamics with renormalization in solid-state charge qubit measurement." Journal of Physics: Condensed Matter 21, no. 38 (August 27, 2009): 385801. http://dx.doi.org/10.1088/0953-8984/21/38/385801.

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25

Graham, Michael J., Joseph M. Zadrozny, Majed S. Fataftah, and Danna E. Freedman. "Forging Solid-State Qubit Design Principles in a Molecular Furnace." Chemistry of Materials 29, no. 5 (February 27, 2017): 1885–97. http://dx.doi.org/10.1021/acs.chemmater.6b05433.

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26

BYRD, M. S., and L. A. WU. "CONTROL AND ERROR PREVENTION IN CONDENSED MATTER QUANTUM COMPUTING DEVICES." International Journal of Modern Physics B 21, no. 13n14 (May 30, 2007): 2505–16. http://dx.doi.org/10.1142/s0217979207043841.

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Proposals for scalable quantum computing devices suffer not only from decoherence due to their interaction with the environment, but also from severe engineering constraints. For example, our ability to implement quantum gates is determined, in part, by the experimentally available interactions with which quantum information may be processed. Here we review a practical solution to some of the major concerns, control and error prevention, addressing solid state proposals for quantum computing devices. Some noise is eliminated by encoding a logical qubit into two qubits, other noise is reduced by an efficient set of decoupling pulse sequences. The same encoding removes the need for single-qubit operations which pose a difficult design constraint. We also discuss several generalizations which follow from this work.

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27

Hermans, S. L. N., M. Pompili, H. K. C. Beukers, S. Baier, J. Borregaard, and R. Hanson. "Qubit teleportation between non-neighbouring nodes in a quantum network." Nature 605, no. 7911 (May 25, 2022): 663–68. http://dx.doi.org/10.1038/s41586-022-04697-y.

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AbstractFuture quantum internet applications will derive their power from the ability to share quantum information across the network1,2. Quantum teleportation allows for the reliable transfer of quantum information between distant nodes, even in the presence of highly lossy network connections3. Although many experimental demonstrations have been performed on different quantum network platforms4–10, moving beyond directly connected nodes has, so far, been hindered by the demanding requirements on the pre-shared remote entanglement, joint qubit readout and coherence times. Here we realize quantum teleportation between remote, non-neighbouring nodes in a quantum network. The network uses three optically connected nodes based on solid-state spin qubits. The teleporter is prepared by establishing remote entanglement on the two links, followed by entanglement swapping on the middle node and storage in a memory qubit. We demonstrate that, once successful preparation of the teleporter is heralded, arbitrary qubit states can be teleported with fidelity above the classical bound, even with unit efficiency. These results are enabled by key innovations in the qubit readout procedure, active memory qubit protection during entanglement generation and tailored heralding that reduces remote entanglement infidelities. Our work demonstrates a prime building block for future quantum networks and opens the door to exploring teleportation-based multi-node protocols and applications2,11–13.

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28

Gali, Ádám. "Ab initio theory of the nitrogen-vacancy center in diamond." Nanophotonics 8, no. 11 (September 18, 2019): 1907–43. http://dx.doi.org/10.1515/nanoph-2019-0154.

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AbstractThe nitrogen-vacancy (NV) center in diamond is a solid-state defect qubit with favorable coherence time up to room temperature, which could be harnessed in several quantum-enhanced sensor and quantum communication applications, and has a potential in quantum simulation and computing. The quantum control largely depends on the intricate details about the electronic structure and states of the NV center, the radiative and nonradiative rates between these states, and the coupling of these states to external spins, electric, magnetic, and strain fields, and temperature. This review shows how first-principles calculations contributed to understanding the properties of the NV center and briefly discusses the issues to be solved toward the full ab initio description of solid-state defect qubits.

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29

PLANAT, M. "ON THE GEOMETRY AND INVARIANTS OF QUBITS, QUARTITS AND OCTITS." International Journal of Geometric Methods in Modern Physics 08, no. 02 (March 2011): 303–13. http://dx.doi.org/10.1142/s0219887811005142.

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Four-level quantum systems, known as quartits, and their relation to two-qubit systems are investigated group theoretically. Following the spirit of Klein's lectures on the icosahedron and their relation to Hopf sphere fibrations, invariants of complex reflection groups occurring in the theory of qubits and quartits are displayed. Then, real gates over octits leading to the Weyl group of E8 and its invariants are derived. Even multilevel systems are of interest in the context of solid state nuclear magnetic resonance.

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30

Sun, Shuo, Hyochul Kim, Zhouchen Luo, Glenn S. Solomon, and Edo Waks. "A single-photon switch and transistor enabled by a solid-state quantum memory." Science 361, no. 6397 (July 5, 2018): 57–60. http://dx.doi.org/10.1126/science.aat3581.

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Single-photon switches and transistors generate strong photon-photon interactions that are essential for quantum circuits and networks. However, the deterministic control of an optical signal with a single photon requires strong interactions with a quantum memory, which has been challenging to achieve in a solid-state platform. We demonstrate a single-photon switch and transistor enabled by a solid-state quantum memory. Our device consists of a semiconductor spin qubit strongly coupled to a nanophotonic cavity. The spin qubit enables a single 63-picosecond gate photon to switch a signal field containing up to an average of 27.7 photons before the internal state of the device resets. Our results show that semiconductor nanophotonic devices can produce strong and controlled photon-photon interactions that could enable high-bandwidth photonic quantum information processing.

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31

Song, Chao, Kai Xu, Hekang Li, Yu-Ran Zhang, Xu Zhang, Wuxin Liu, Qiujiang Guo, et al. "Generation of multicomponent atomic Schrödinger cat states of up to 20 qubits." Science 365, no. 6453 (August 8, 2019): 574–77. http://dx.doi.org/10.1126/science.aay0600.

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Multipartite entangled states are crucial for numerous applications in quantum information science. However, the generation and verification of multipartite entanglement on fully controllable and scalable quantum platforms remains an outstanding challenge. We report the deterministic generation of an 18-qubit Greenberger-Horne-Zeilinger (GHZ) state and multicomponent atomic Schrödinger cat states of up to 20 qubits on a quantum processor, which features 20 superconducting qubits, also referred to as artificial atoms, interconnected by a bus resonator. By engineering a one-axis twisting Hamiltonian, the system of qubits, once initialized, coherently evolves to multicomponent atomic Schrödinger cat states—that is, superpositions of atomic coherent states including the GHZ state—at specific time intervals as expected. Our approach on a solid-state platform should not only stimulate interest in exploring the fundamental physics of quantum many-body systems, but also enable the development of applications in practical quantum metrology and quantum information processing.

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32

Hays, M., V. Fatemi, D. Bouman, J. Cerrillo, S. Diamond, K. Serniak, T. Connolly, et al. "Coherent manipulation of an Andreev spin qubit." Science 373, no. 6553 (July 22, 2021): 430–33. http://dx.doi.org/10.1126/science.abf0345.

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Two promising architectures for solid-state quantum information processing are based on electron spins electrostatically confined in semiconductor quantum dots and the collective electrodynamic modes of superconducting circuits. Superconducting electrodynamic qubits involve macroscopic numbers of electrons and offer the advantage of larger coupling, whereas semiconductor spin qubits involve individual electrons trapped in microscopic volumes but are more difficult to link. We combined beneficial aspects of both platforms in the Andreev spin qubit: the spin degree of freedom of an electronic quasiparticle trapped in the supercurrent-carrying Andreev levels of a Josephson semiconductor nanowire. We performed coherent spin manipulation by combining single-shot circuit–quantum-electrodynamics readout and spin-flipping Raman transitions and found a spin-flip time TS = 17 microseconds and a spin coherence time T2E = 52 nanoseconds. These results herald a regime of supercurrent-mediated coherent spin-photon coupling at the single-quantum level.

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33

WALTERS, RICHARD, STEPHEN R. CLARK, and DIETER JAKSCH. "DECOHERENCE OF A QUANTUM MEMORY COUPLED TO A COLLECTIVE SPIN BATH." International Journal of Quantum Information 08, no. 01n02 (February 2010): 271–94. http://dx.doi.org/10.1142/s0219749910005934.

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We study the quantum dynamics of a single qubit coupled to a bath of interacting spins as a model for decoherence in solid state quantum memories. The spin bath is described by the Lipkin-Meshkov-Glick model and the bath spins are subjected to a transverse magnetic field. We investigate the qubit interacting via either an Ising- or an XY-type coupling term to subsets of bath spins of differing size. The large degree of symmetry of the bath allows us to find parameter regimes where the initial qubit state is revived at well-defined times after the qubit preparation. These times may become independent of the bath size for large baths and thus enable faithful qubit storage even in the presence of strong coupling to a bath. We analyze a large range of parameters and identify those which are best suited for quantum memories. In general we find that a small number of links between qubit and bath spins leads to less decoherence and that systems with Ising coupling between qubit and bath spins are preferable.

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34

Howard, M., J. Twamley, C. Wittmann, T. Gaebel, F. Jelezko, and J. Wrachtrup. "Quantum process tomography and Linblad estimation of a solid-state qubit." New Journal of Physics 8, no. 3 (March 6, 2006): 33. http://dx.doi.org/10.1088/1367-2630/8/3/033.

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35

Caflisch, R. E., Mark F. Gyure, Hans D. Robinson, and Eli Yablonovitch. "Modeling, Design, and Optimization of a Solid State Electron Spin Qubit." SIAM Journal on Applied Mathematics 65, no. 4 (January 2005): 1285–304. http://dx.doi.org/10.1137/040606181.

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36

Nowack, K. C., M. Shafiei, M. Laforest, G. E. D. K. Prawiroatmodjo, L. R. Schreiber, C. Reichl, W. Wegscheider, and L. M. K. Vandersypen. "Single-Shot Correlations and Two-Qubit Gate of Solid-State Spins." Science 333, no. 6047 (August 4, 2011): 1269–72. http://dx.doi.org/10.1126/science.1209524.

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Measurement of coupled quantum systems plays a central role in quantum information processing. We have realized independent single-shot read-out of two electron spins in a double quantum dot. The read-out method is all-electrical, cross-talk between the two measurements is negligible, and read-out fidelities are ~86% on average. This allows us to directly probe the anticorrelations between two spins prepared in a singlet state and to demonstrate the operation of the two-qubit exchange gate on a complete set of basis states. The results provide a possible route to the realization and efficient characterization of multiqubit quantum circuits based on single quantum dot spins.

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37

Zhao, Xu, and Xian-Ting Liang. "Short-Time Decoherence of Solid-State Qubit at Optimal Operation Points." Communications in Theoretical Physics 44, no. 5 (November 2005): 827–32. http://dx.doi.org/10.1088/6102/44/5/827.

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38

Villar, Paula I., and Fernando C. Lombardo. "Decoherence of a solid-state qubit by different noise correlation spectra." Physics Letters A 379, no. 4 (February 2015): 246–54. http://dx.doi.org/10.1016/j.physleta.2014.11.022.

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39

Cheng, Liu-Yong, Li-Na Zheng, Ruixiang Wu, Hong-Fu Wang, and Shou Zhang. "Change-over switch for quantum states transfer with topological channels in a circuit-QED lattice." Chinese Physics B 31, no. 2 (January 1, 2022): 020305. http://dx.doi.org/10.1088/1674-1056/ac2f2e.

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We propose schemes to realize robust quantum states transfer between distant resonators using the topological edge states of a one-dimensional circuit quantum electrodynamics (QED) lattice. Analyses show that the distribution of edge states can be regulated accordingly with the on-site defects added on the resonators. And we can achieve different types of quantum state transfer without adjusting the number of lattices. Numerical simulations demonstrate that the on-site defects can be used as a change-over switch for high-fidelity single-qubit and two-qubit quantum states transfer. This work provides a viable prospect for flexible quantum state transfer in solid-state topological quantum system.

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40

Togan, E., Y. Chu, A. S. Trifonov, L. Jiang, J. Maze, L. Childress, M. V. G. Dutt, et al. "Quantum entanglement between an optical photon and a solid-state spin qubit." Nature 466, no. 7307 (August 2010): 730–34. http://dx.doi.org/10.1038/nature09256.

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41

Savory, Seb. "Disentangling the control electron in a two qubit solid state quantum gate." Journal of Physics: Condensed Matter 18, no. 21 (May 12, 2006): S777—S782. http://dx.doi.org/10.1088/0953-8984/18/21/s05.

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42

Goorden, M. C., M. Thorwart, and M. Grifoni. "Spectroscopy of a driven solid-state qubit coupled to a structured environment." European Physical Journal B 45, no. 3 (June 2005): 405–17. http://dx.doi.org/10.1140/epjb/e2005-00192-5.

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43

Dehollain, Juan P., Juha T. Muhonen, Robin Blume-Kohout, Kenneth M. Rudinger, John King Gamble, Erik Nielsen, Arne Laucht, et al. "Optimization of a solid-state electron spin qubit using gate set tomography." New Journal of Physics 18, no. 10 (October 13, 2016): 103018. http://dx.doi.org/10.1088/1367-2630/18/10/103018.

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44

Yale, Christopher G., F. Joseph Heremans, Brian B. Zhou, Adrian Auer, Guido Burkard, and David D. Awschalom. "Optical manipulation of the Berry phase in a solid-state spin qubit." Nature Photonics 10, no. 3 (February 15, 2016): 184–89. http://dx.doi.org/10.1038/nphoton.2015.278.

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45

Hou, P. Y., L. He, F. Wang, X. Z. Huang, W. G. Zhang, X. L. Ouyang, X. Wang, W. Q. Lian, X. Y. Chang, and L. M. Duan. "Experimental Hamiltonian Learning of an 11-Qubit Solid-State Quantum Spin Register*." Chinese Physics Letters 36, no. 10 (October 2019): 100303. http://dx.doi.org/10.1088/0256-307x/36/10/100303.

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46

Li, Zhi-Qiang, and Xian-Ting Liang. "Decoherence and purity of a driven solid-state qubit in Ohmic bath." Physica E: Low-dimensional Systems and Nanostructures 40, no. 8 (June 2008): 2671–76. http://dx.doi.org/10.1016/j.physe.2007.12.003.

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47

Vliex, P., C. Degenhardt, C. Grewing, A. Kruth, D. Nielinger, S. van Waasen, and S. Heinen. "Bias Voltage DAC Operating at Cryogenic Temperatures for Solid-State Qubit Applications." IEEE Solid-State Circuits Letters 3 (2020): 218–21. http://dx.doi.org/10.1109/lssc.2020.3011576.

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48

Tsai, J. S., Y. Nakamura, and YU Pashkin. "Qubit utilizing charge-number state in super conducting nanostructure." Quantum Information and Computation 1, Special (December 2001): 124–28. http://dx.doi.org/10.26421/qic1.s-13.

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In single-Cooper-pair box, the number of electrons in the box is quantized and they form a single macroscopic quantum charge-number state, corresponding to the number of excess electrons in the box. By making all the electrodes superconducting, we can couple two neighboring charge-number states coherently. In this way one can create an artificial two-level system. Qubit operations were demonstrated in two different control techniques, dc electric-field gate bias and ac field bias. The dc method was unique compared with the commonly used Rabi-oscillation-type operation. Here the system was biased at the degenerate point of the two states so that the dynamical phase does not develop during the operation. This was the first time that the quantum coherent oscillation was observed in a solid-state device whose quantum states involved a macroscopic number of quantum particles. Multiple-pulse experiments were also carried out and phase control was also demonstrated.

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Czischek, Stefanie, Victor Yon, Marc-Antoine Genest, Marc-Antoine Roux, Sophie Rochette, Julien Camirand Lemyre, Mathieu Moras, et al. "Miniaturizing neural networks for charge state autotuning in quantum dots." Machine Learning: Science and Technology 3, no. 1 (November 24, 2021): 015001. http://dx.doi.org/10.1088/2632-2153/ac34db.

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Abstract A key challenge in scaling quantum computers is the calibration and control of multiple qubits. In solid-state quantum dots (QDs), the gate voltages required to stabilize quantized charges are unique for each individual qubit, resulting in a high-dimensional control parameter space that must be tuned automatically. Machine learning techniques are capable of processing high-dimensional data—provided that an appropriate training set is available—and have been successfully used for autotuning in the past. In this paper, we develop extremely small feed-forward neural networks that can be used to detect charge-state transitions in QD stability diagrams. We demonstrate that these neural networks can be trained on synthetic data produced by computer simulations, and robustly transferred to the task of tuning an experimental device into a desired charge state. The neural networks required for this task are sufficiently small as to enable an implementation in existing memristor crossbar arrays in the near future. This opens up the possibility of miniaturizing powerful control elements on low-power hardware, a significant step towards on-chip autotuning in future QD computers.

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Szász, Krisztián, Viktor Ivády, Erik Janzén, and Ádám Gali. "First Principles Investigation of Divacancy in SiC Polytypes for Solid State Qubit Application." Materials Science Forum 778-780 (February 2014): 499–502. http://dx.doi.org/10.4028/www.scientific.net/msf.778-780.499.

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We calculated the hyperfine structure and the zero-field splitting parameters of divacancies in 3C, 4Hand 6HSiC in the ground state and in the excited state for 4HSiC within the framework of density functional theory. Besides that our calculations provide identification of the defect in different polytypes, we can find some carbon atoms next to the divacancy that of the spin polarizations are similar in the ground and excited states. This coherent nuclear spin polarization phenomenon can be the base to utilize13C spins as quantum memory.

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