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Artykuły w czasopismach na temat „Superconducting quantum devices”

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Data publikacji: 6 września 2023

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1

Su, Fei-Fan, Zhao-Hua Yang, Shou-Kuan Zhao, Hai-Sheng Yan, Ye Tian i Shi-Ping Zhao. "Fabrication of superconducting qubits and auxiliary devices with niobium base layer". Acta Physica Sinica 71, nr 5 (2022): 050303. http://dx.doi.org/10.7498/aps.71.20211865.

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Over the past two decades significant advances have been made in the research of superconducting quantum computing and quantum simulation, in particular of the device design and fabrication that leads to ever-increasing superconducting qubit coherence times and scales. With Google’s announcement of the realization of “quantum supremacy”, superconducting quantum computing has attracted even more attention. Superconducting qubits are macroscopic objects with quantum properties such as quantized energy levels and quantum-state superposition and entanglement. Their quantum states can be precisely manipulated by tuning the magnetic flux, charge, and phase difference of the Josephson junctions with nonlinear inductance through electromagnetic pulse signals, thereby implementing the quantum information processing. They have advantages in many aspects and are expected to become the central part of universal quantum computing. Superconducting qubits and auxiliary devices prepared with niobium or other hard metals like tantalum as bottom layers of large-area components have unique properties and potentials for further development. In this paper the research work in this area is briefly reviewed, starting from the design and working principle of a variety of superconducting qubits, to the detailed procedures of substrate selection and pretreatment, film growth, pattern transfer, etching, and Josephson junction fabrication, and finally the practical superconducting qubit and their auxiliary device fabrications with niobium base layers are also presented. We aim to provide a clear overview for the fabrication process of these superconducting devices as well as an outlook for further device improvement and optimization in order to help establish a perspective for future progress.

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2

Shi, Wenbo, i Robert Malaney. "Entanglement of Signal Paths via Noisy Superconducting Quantum Devices". Entropy 25, nr 1 (12.01.2023): 153. http://dx.doi.org/10.3390/e25010153.

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Quantum routers will provide for important functionality in emerging quantum networks, and the deployment of quantum routing in real networks will initially be realized on low-complexity (few-qubit) noisy quantum devices. A true working quantum router will represent a new application for quantum entanglement—the coherent superposition of multiple communication paths traversed by the same quantum signal. Most end-user benefits of this application are yet to be discovered, but a few important use-cases are now known. In this work, we investigate the deployment of quantum routing on low-complexity superconducting quantum devices. In such devices, we verify the quantum nature of the routing process as well as the preservation of the routed quantum signal. We also implement quantum random access memory, a key application of quantum routing, on these same devices. Our experiments then embed a five-qubit quantum error-correcting code within the router, outlining the pathway for error-corrected quantum routing. We detail the importance of the qubit-coupling map for a superconducting quantum device that hopes to act as a quantum router, and experimentally verify that optimizing the number of controlled-X gates decreases hardware errors that impact routing performance. Our results indicate that near-term realization of quantum routing using noisy superconducting quantum devices within real-world quantum networks is possible.

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3

Dhakal, Pashupati. "Superconducting Radio Frequency Resonators for Quantum Computing: A Short Review". Journal of Nepal Physical Society 7, nr 3 (31.12.2021): 1–5. http://dx.doi.org/10.3126/jnphyssoc.v7i3.42179.

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Superconducting radiofrequency (SRF) technology is being used not only in discovery science programs and basic research but also for several applications that benefit society more directly. The advantage of superconducting resonators over those made of normal-conducting metal is their ability to store electromagnetic energy with much lower dissipation. The high-quality factor and longer dissipation time provided by these superconducting resonators can deliver superior performance. Currently, the quantum processing architecture uses resonators and interconnecting circuits operating in the microwave regime with superconducting strip-line technology and low noise electronic devices for switching and communication. The performance of these devices can be enhanced by embedding them in 3D SRF cavity resonators to prolong the coherence time, which improves the utility of the device by reducing error rates and allowing more manipulations (calculations) before the quantum state decays. Here, we present a short review of current microwave technology used in quantum computers and progress towards the 3D resonators to enhance thecoherence time.

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4

Song, Chao, Jing Cui, H. Wang, J. Hao, H. Feng i Ying Li. "Quantum computation with universal error mitigation on a superconducting quantum processor". Science Advances 5, nr 9 (wrzesień 2019): eaaw5686. http://dx.doi.org/10.1126/sciadv.aaw5686.

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Medium-scale quantum devices that integrate about hundreds of physical qubits are likely to be developed in the near future. However, these devices will lack the resources for realizing quantum fault tolerance. Therefore, the main challenge of exploring the advantage of quantum computation is to minimize the impact of device and control imperfections without complete logical encoding. Quantum error mitigation is a solution satisfying the requirement. Here, we demonstrate an error mitigation protocol based on gate set tomography and quasi-probability decomposition. One- and two-qubit circuits are tested on a superconducting device, and computation errors are successfully suppressed. Because this protocol is universal for digital quantum computers and algorithms computing expected values, our results suggest that error mitigation can be an essential component of near-future quantum computation.

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5

Castellano, M. G. "Macroscopic quantum behavior of superconducting quantum interference devices". Fortschritte der Physik 51, nr 45 (7.05.2003): 288–94. http://dx.doi.org/10.1002/prop.200310041.

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6

CHIARELLO, F., M. G. CASTELLANO, R. LEONI, G. TORRIOLI, C. COSMELLI i P. CARELLI. "JOSEPHSON DEVICES FOR QUANTUM COMPUTING". International Journal of Modern Physics B 17, nr 04n06 (10.03.2003): 675–79. http://dx.doi.org/10.1142/s021797920301642x.

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Computing tools, all based on classical logic at the moment, present intrinsic limitations that can be overcome by using quantum logic. In this direction, superconducting Josephson devices have been proved to be very suitable candidates for the realization of quantum computing tools. We present some basic elements of quantum computing, possible strategies for the implementation of quantum gates by using Josephson devices, and recent experimental results in this field.

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7

De Luca, R. "Equivalent Single-Junction Model of Superconducting Quantum Interference Devices in the Presence of Time-Varying Fields". ISRN Condensed Matter Physics 2011 (30.11.2011): 1–5. http://dx.doi.org/10.5402/2011/724384.

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The reduced dynamical model of a two-junction quantum interference device is generalized to the case of time-varying externally applied fluxes with a d. c. component and an oscillating addendum whose frequency is comparable with the inverse of the characteristic time for flux dynamics within the superconducting system. From the resulting effective single-junction model for null inductance of the superconducting loop, it can be seen that the critical current of the device shows a dependence on the frequency and amplitude of the oscillating part of the applied flux. It can therefore be argued that the latter quantities can be considered as control parameters in the voltage versus applied flux curves of superconducting quantum interference devices.

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8

Pegrum, Colin. "Modelling high- Tc electronics". Superconductor Science and Technology 36, nr 5 (9.03.2023): 053001. http://dx.doi.org/10.1088/1361-6668/acbb35.

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Abstract This Review examines methods to model Josephson devices such as arrays of superconducting quantum interference devices (SQUIDs) and rows within two-dimensional superconducting quantum interference filters or SQIFs. The emphasis is on high temperature superconducting (HTS) devices, though the techniques apply for any operating temperature. The methods use freely-available and proven software to first extract all self and mutual inductances of the thin-film device, and then to incorporate these data, plus junction models and thermal noise sources into an equivalent circuit for Josephson simulation. The inductance extraction stage also estimates the effective areas of each loop in a structure and also the variation of inductance as temperature changes, due to the varying penetration depth. The final post-processing stage can yield current–voltage, voltage-field and field spectral density responses. The Review also touches briefly on the simulation of a simple model for a terahertz single-junction HTS mixer and also looks at the behaviour of typical hysteretic and non-hysteric HTS RF SQUIDs.

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9

Mutsenik, E., S. Linzen, E. Il’ichev, M. Schmelz, M. Ziegler, V. Ripka, B. Steinbach, G. Oelsner, U. Hübner i R. Stolz. "Superconducting NbN-Al hybrid technology for quantum devices". Low Temperature Physics 49, nr 1 (styczeń 2023): 92–95. http://dx.doi.org/10.1063/10.0016481.

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The high kinetic inductance of niobium nitride (NbN) thin films can be used for an implementation of compact on-chip inductances in cryoelectronic circuits. Here, for the first time, we demonstrate the implementation of a hybrid superconducting technology that includes the fabrication of standard aluminum submicron Josephson junctions and the NbN atomic layer deposition process. As an example, we fabricated and characterized a single and array of Al Josephson junctions together with NbN interconnections. The main Al Josephson junction parameters as well as NbN superconducting properties are in a good agreement with the values obtained by our standard fabrication process. The combination of technological processes for the NbN layers with Al Josephson junction allows implementing a new generation of innovative superconducting devices for different applications.

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10

Vettoliere, Antonio, i Carmine Granata. "Picoammeters Based on Gradiometric Superconducting Quantum Interference Devices". Applied Sciences 12, nr 18 (8.09.2022): 9030. http://dx.doi.org/10.3390/app12189030.

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High-sensitivity ac current sensors based on a superconducting quantum interference device have been designed, fabricated and characterized. In particular, double-washer schemes in either parallel or series configurations have been considered. The advantages and the drawbacks of both configurations have been examined by measuring the main features and parameters, such as the flux-to-voltage characteristic, the magnetic field spectral noise and flux-to-current transfer factor. The devices are designed to have similar flux-to-current transfer factors and are fabricated on the same chip to avoid differences in parameters due to the fabrication process. Both devices exhibited a current sensitivity as low as 1–2 pA per bandwidth unit, allowing for their use in ultrahigh-sensitivity applications.

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11

Ahmad, Halima Giovanna, Caleb Jordan, Roald van den Boogaart, Daan Waardenburg, Christos Zachariadis, Pasquale Mastrovito, Asen Lyubenov Georgiev i in. "Investigating the Individual Performances of Coupled Superconducting Transmon Qubits". Condensed Matter 8, nr 1 (21.03.2023): 29. http://dx.doi.org/10.3390/condmat8010029.

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The strong requirement for high-performing quantum computing led to intensive research on novel quantum platforms in the last decades. The circuital nature of Josephson-based quantum superconducting systems powerfully supports massive circuital freedom, which allowed for the implementation of a wide range of qubit designs, and an easy interface with the quantum processing unit. However, this unavoidably introduces a coupling with the environment, and thus to extra decoherence sources. Moreover, at the time of writing, control and readout protocols mainly use analogue microwave electronics, which limit the otherwise reasonable scalability in superconducting quantum circuits. Within the future perspective to improve scalability by integrating novel control energy-efficient superconducting electronics at the quantum stage in a multi-chip module, we report on an all-microwave characterization of a planar two-transmon qubits device, which involves state-of-the-art control pulses optimization. We demonstrate that the single-qubit average gate fidelity is mainly limited by the gate pulse duration and the quality of the optimization, and thus does not preclude the integration in novel hybrid quantum-classical superconducting devices.

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12

Marchiori, E., L. Ceccarelli, N. Rossi, G. Romagnoli, J. Herrmann, J. C. Besse, S. Krinner, A. Wallraff i M. Poggio. "Magnetic imaging of superconducting qubit devices with scanning SQUID-on-tip". Applied Physics Letters 121, nr 5 (1.08.2022): 052601. http://dx.doi.org/10.1063/5.0103597.

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We use a scanning superconducting quantum interference device (SQUID) to image the magnetic flux produced by a superconducting device designed for quantum computing. The nanometer-scale SQUID-on-tip probe reveals the flow of superconducting current through the circuit as well as the locations of trapped magnetic flux. In particular, maps of current flowing out of a flux-control line in the vicinity of a qubit show how these elements are coupled, providing insight on how to optimize qubit control.

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13

McRae, Corey Rae H., Gregory M. Stiehl, Haozhi Wang, Sheng-Xiang Lin, Shane A. Caldwell, David P. Pappas, Josh Mutus i Joshua Combes. "Reproducible coherence characterization of superconducting quantum devices". Applied Physics Letters 119, nr 10 (6.09.2021): 100501. http://dx.doi.org/10.1063/5.0060370.

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14

Koelle, D., R. Kleiner, F. Ludwig, E. Dantsker i John Clarke. "High-transition-temperature superconducting quantum interference devices". Reviews of Modern Physics 71, nr 3 (1.04.1999): 631–86. http://dx.doi.org/10.1103/revmodphys.71.631.

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15

Sarnelli, E., C. Nappi, A. Leveratto, E. Bellingeri, V. Braccini i C. Ferdeghini. "Fe(Se,Te) superconducting quantum interference devices". Superconductor Science and Technology 30, nr 6 (15.05.2017): 065003. http://dx.doi.org/10.1088/1361-6668/aa6a84.

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16

Romeo, F., i R. De Luca. "Persistent currents in superconducting quantum interference devices". Physics Letters A 373, nr 15 (marzec 2009): 1383–86. http://dx.doi.org/10.1016/j.physleta.2009.02.013.

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17

Testa, G., C. Granata, C. Calidonna, C. Di Russo, M. Mango Furnari, S. Pagano, M. Russo i E. Sarnelli. "Performance of asymmetric superconducting quantum interference devices". Physica C: Superconductivity 368, nr 1-4 (marzec 2002): 232–35. http://dx.doi.org/10.1016/s0921-4534(01)01172-8.

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18

Testa, G., E. Sarnelli, S. Pagano, C. R. Calidonna i M. Mango Furnari. "Characteristics of asymmetric superconducting quantum interference devices". Journal of Applied Physics 89, nr 9 (maj 2001): 5145–50. http://dx.doi.org/10.1063/1.1360219.

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19

Vetlugin, Anton N., Cesare Soci i Nikolay I. Zheludev. "Modeling quantum light interference on a quantum computer". Applied Physics Letters 121, nr 10 (5.09.2022): 104001. http://dx.doi.org/10.1063/5.0103361.

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Modeling of photonic devices traditionally involves solving the equations of light–matter interaction and light propagation. Here, we demonstrate an alternative modeling methodology by reproducing the optical device functionality using a quantum computer. As an illustration, we simulate the quantum interference of light on a thin absorbing film. Such interference can lead to either perfect absorption or total transmission of light through the film, the phenomena attracting attention for data processing applications in classical and quantum information networks. We map the behavior of the photon in the interference experiment to the evolution of a quantum state of transmon, a superconducting charge qubit of the IBM quantum computer. Details of the real optical experiment are flawlessly reproduced on the quantum computer. We argue that the superiority of this methodology shall be apparent in modeling complex multi-photon optical phenomena and devices.

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20

Esposito, Martina, Joseph Rahamim, Andrew Patterson, Matthias Mergenthaler, James Wills, Giulio Campanaro, Takahiro Tsunoda i in. "Development and characterization of a flux-pumped lumped element Josephson parametric amplifier". EPJ Web of Conferences 198 (2019): 00008. http://dx.doi.org/10.1051/epjconf/201919800008.

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Josephson parametric amplification is a tool of paramount importance in circuit-QED especially for the quantum-noise-limited single-shot read-out of superconducting qubits. We developed a Josephson parametric amplifier (JPA) based on a lumped-element LC resonator, in which the inductance L is composed by a geometric inductance and an array of 4 superconducting quantum interference devices (SQUIDs). We characterized the main figures of merit of the device, obtaining a −3 dB bandwidth BW = 15 MHz for a gain G = 21 dB and a 1 dB compression point P1dB = −115 dBm. The obtained results are promising for the future use of such JPA as the first stage of amplification for single-shot readout of superconducting qubits.

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21

ATALLAH, A. S., A. H. PHILLIPS, A. F. AMIN i M. A. SEMARY. "PHOTON-ASSISTED TRANSPORT CHARACTERISTICS THROUGH QUANTUM DOT COUPLED TO SUPERCONDUCTING RESERVOIRS". Nano 01, nr 03 (listopad 2006): 259–64. http://dx.doi.org/10.1142/s179329200600029x.

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The influence of time-varying fields on the transport through a mesoscopic device has been investigated. This mesoscopic device is modeled as a quantum dot coupled to superconducting reservoirs via quantum point contact. The effect of a magnetic field and the Andreev reflection process were taken into account. The conductance was deduced by using Landuaer–Buttiker equation. A numerical calculation has been performed that shows a resonant tunneling behavior. Such investigation is important for fabricating photoelectron mesoscopic devices.

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22

Katayama, Haruna, Toshiyuki Fujii i Noriyuki Hatakenaka. "Theory of a quantum artificial neuron based on superconducting devices". International Journal of Engineering & Technology 7, nr 3.29 (24.08.2018): 150. http://dx.doi.org/10.14419/ijet.v7i3.29.18546.

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An artificial neuron using superconducting devices, so-called rf SQUID, working at the quantum-mechanical domain is studied. It is shown that quantum rf SQUID regarded as flux qubit can act as an artificial neuron with sigmoid function generated by coherent quantum-mechanical transitions between wells in double well potential representing rf SQUID.

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23

Vettoliere, A., R. Satariano, R. Ferraiuolo, L. Di Palma, H. G. Ahmad, G. Ausanio, G. P. Pepe i in. "Aluminum-ferromagnetic Josephson tunnel junctions for high quality magnetic switching devices". Applied Physics Letters 120, nr 26 (27.06.2022): 262601. http://dx.doi.org/10.1063/5.0101686.

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The competition between superconducting and ferromagnetic orderings in Josephson devices has promoted fundamental and applicative studies of high impact for superconducting digital technology, cryogenic memories, and spintronics, where the possibility of switching between different magnetic states is a crucial advantage. Here, we report on fabrication and characterization of very high quality tunnel ferromagnetic Josephson junctions (JJs) with aluminum electrodes, demonstrating hysteretic behavior of the magnetic field pattern preserving typical transport properties of Al junctions, underdamped behavior, and very low quasiparticle dissipation. The proposed technology paves the way for the possible implementation of Al tunnel-ferromagnetic JJs in superconducting quantum circuits, toward alternative approaches based on digital control of the Josephson device.

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24

Yan, Lu, Dong Ping, Xue Zheng-Yuan i Cao Zhuo-Liang. "Quantum search via superconducting quantum interference devices in a cavity". Chinese Physics 16, nr 12 (grudzień 2007): 3601–4. http://dx.doi.org/10.1088/1009-1963/16/12/008.

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25

Chiarello, F. "Quantum computing with superconducting quantum interference devices: a possible strategy". Physics Letters A 277, nr 4-5 (grudzień 2000): 189–93. http://dx.doi.org/10.1016/s0375-9601(00)00714-3.

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26

Yi, H. R., Y. Zhang, J. Schubert, W. Zander, X. H. Zeng i N. Klein. "Superconducting multiturn flux transformers for radio frequency superconducting quantum interference devices". Journal of Applied Physics 88, nr 10 (15.11.2000): 5966–74. http://dx.doi.org/10.1063/1.1322382.

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27

Nakayama, Akiyoshi, Takuma Sugio, Koji Manabe i Yoichi Okabe. "Characteristics of superconducting quantum interference devices using multi-barrier superconducting junctions". Journal of Applied Physics 89, nr 11 (czerwiec 2001): 7499–501. http://dx.doi.org/10.1063/1.1359461.

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28

Waseem, Muhammad, Muhammad Irfan i Shahid Qamar. "Multiqubit quantum phase gate using four-level superconducting quantum interference devices coupled to superconducting resonator". Physica C: Superconductivity 477 (lipiec 2012): 24–31. http://dx.doi.org/10.1016/j.physc.2012.02.024.

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29

Saito, Atsushi, Katsuyoshi Hamasaki i Takashi Ishiguro. "Fabrication and Quantum Phenomena of Superconducting Mesoscopic Devices." Materia Japan 38, nr 11 (1999): 880–87. http://dx.doi.org/10.2320/materia.38.880.

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Hazra, D., J. R. Kirtley i K. Hasselbach. "Nano-superconducting quantum interference devices with suspended junctions". Applied Physics Letters 104, nr 15 (14.04.2014): 152603. http://dx.doi.org/10.1063/1.4871317.

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Pedyash, M. V., D. H. A. Blank i H. Rogalla. "Superconducting quantum interference devices based on YBaCuO nanobridges". Applied Physics Letters 68, nr 8 (19.02.1996): 1156–58. http://dx.doi.org/10.1063/1.115708.

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Testa, G., S. Pagano, E. Sarnelli, C. R. Calidonna i M. Mango Furnari. "Improved superconducting quantum interference devices by resistance asymmetry". Applied Physics Letters 79, nr 18 (29.10.2001): 2943–45. http://dx.doi.org/10.1063/1.1413733.

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33

Gallop, John, i Ling Hao. "Nanoscale Superconducting Quantum Interference Devices Add Another Dimension". ACS Nano 10, nr 9 (31.08.2016): 8128–32. http://dx.doi.org/10.1021/acsnano.6b04844.

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Rouse, R., Siyuan Han i J. E. Lukens. "Flux amplification using stochastic superconducting quantum interference devices". Applied Physics Letters 66, nr 1 (2.01.1995): 108–10. http://dx.doi.org/10.1063/1.114161.

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35

Zhou, Yuchao W., Hao Li, Ethan Y. Cho, Han Cai, Guy Covert i Shane A. Cybart. "Electronic Feedback System for Superconducting Quantum Interference Devices". IEEE Transactions on Applied Superconductivity 30, nr 7 (październik 2020): 1–5. http://dx.doi.org/10.1109/tasc.2020.3006429.

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Brehm, Jan David, Richard Gebauer, Alexander Stehli, Alexander N. Poddubny, Oliver Sander, Hannes Rotzinger i Alexey V. Ustinov. "Slowing down light in a qubit metamaterial". Applied Physics Letters 121, nr 20 (14.11.2022): 204001. http://dx.doi.org/10.1063/5.0122003.

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The rapid progress in quantum information processing leads to a rising demand for devices to control the propagation of electromagnetic wave pulses and to ultimately realize universal and efficient quantum memory. While in recent years, significant progress has been made to realize slow light and quantum memories with atoms at optical frequencies, superconducting circuits in the microwave domain still lack such devices. Here, we demonstrate slowing down electromagnetic waves in a superconducting metamaterial composed of eight qubits coupled to a common waveguide, forming a waveguide quantum electrodynamics system. We analyze two complementary approaches, one relying on dressed states of the Autler–Townes splitting and the other based on a tailored dispersion profile using the qubits tunability. Our time-resolved experiments show reduced group velocities of down to a factor of about 1500 smaller than in vacuum. Depending on the method used, the speed of light can be controlled with an additional microwave tone or an effective qubit detuning. Our findings demonstrate high flexibility of superconducting circuits to realize custom band structures and open the door to microwave dispersion engineering in the quantum regime.

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37

Walsh, Evan D., Woochan Jung, Gil-Ho Lee, Dmitri K. Efetov, Bae-Ian Wu, K. F. Huang, Thomas A. Ohki i in. "Josephson junction infrared single-photon detector". Science 372, nr 6540 (22.04.2021): 409–12. http://dx.doi.org/10.1126/science.abf5539.

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Josephson junctions are superconducting devices used as high-sensitivity magnetometers and voltage amplifiers as well as the basis of high-performance cryogenic computers and superconducting quantum computers. Although device performance can be degraded by the generation of quasiparticles formed from broken Cooper pairs, this phenomenon also opens opportunities to sensitively detect electromagnetic radiation. We demonstrate single near-infrared photon detection by coupling photons to the localized surface plasmons of a graphene-based Josephson junction. Using the photon-induced switching statistics of the current-biased device, we reveal the critical role of quasiparticles generated by the absorbed photon in the detection mechanism. The photon sensitivity will enable a high-speed, low-power optical interconnect for future superconducting computing architectures.

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ZHAN, ZHIMING. "REALIZATION OF QUANTUM LOGIC GATES AND CLUSTER STATES WITH SUPERCONDUCTING QUANTUM-INTERFERENCE DEVICES". International Journal of Quantum Information 09, nr 01 (luty 2011): 563–70. http://dx.doi.org/10.1142/s0219749911007423.

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We propose a method for realizing quantum logic gates and cluster states with superconducting quantum-interference devices (SQUIDs) in cavity QED via Raman transition. In this proposal, quantum logic gates and cluster states are realized by using only two lower flux states of the SQUID system and the excited state would not be excited. Therefore, the effect of decoherence caused by the levels of the SQUID system is possibly minimized.

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39

Pekola, Jukka P. "Quantum thermodynamics at low temperatures". Europhysics News 52, nr 3 (2021): 15–17. http://dx.doi.org/10.1051/epn/2021302.

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Low temperature phenomena and methods are quantum thermodynamics per se. Modern engineered quantum systems, for instance those used for superconducting quantum information processing and mesoscopic electron transport, provide working media for realizing devices such as quantum heat engines and refrigerators and a testbed for fundamental principles and phenomena in thermodynamics of quantum systems and processes.

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Tarasov, Mikhail, Andrey Lomov, Artem Chekushkin, Mikhail Fominsky, Denis Zakharov, Andrey Tatarintsev, Sergey Kraevsky i Anton Shadrin. "Quasiepitaxial Aluminum Film Nanostructure Optimization for Superconducting Quantum Electronic Devices". Nanomaterials 13, nr 13 (4.07.2023): 2002. http://dx.doi.org/10.3390/nano13132002.

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In this paper, we develop fabrication technology and study aluminum films intended for superconducting quantum nanoelectronics using AFM, SEM, XRD, HRXRR. Two-temperature-step quasiepitaxial growth of Al on (111) Si substrate provides a preferentially (111)-oriented Al polycrystalline film and reduces outgrowth bumps, peak-to-peak roughness from 70 to 10 nm, and texture coefficient from 3.5 to 1.7, while increasing hardness from 5.4 to 16 GPa. Future progress in superconducting current density, stray capacitance, relaxation time, and noise requires a reduction in structural defect density and surface imperfections, which can be achieved by improving film quality using such quasiepitaxial growth techniques.

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Antony, Abhinandan, Martin V. Gustafsson, Anjaly Rajendran, Avishai Benyamini, Guilhem Ribeill, Thomas A. Ohki, James Hone i Kin Chung Fong. "Making high-quality quantum microwave devices with van der Waals superconductors". Journal of Physics: Condensed Matter 34, nr 10 (21.12.2021): 103001. http://dx.doi.org/10.1088/1361-648x/ac3e9d.

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Abstract Ultra low-loss microwave materials are crucial for enhancing quantum coherence and scalability of superconducting qubits. Van der Waals (vdW) heterostructure is an attractive platform for quantum devices due to the single-crystal structure of the constituent two-dimensional (2D) layered materials and the lack of dangling bonds at their atomically sharp interfaces. However, new fabrication and characterization techniques are required to determine whether these structures can achieve low loss in the microwave regime. Here we report the fabrication of superconducting microwave resonators using NbSe2 that achieve a quality factor Q > 105. This value sets an upper bound that corresponds to a resistance of ⩽ 192 μ Ω when considering the additional loss introduced by integrating NbSe2 into a standard transmon circuit. This work demonstrates the compatibility of 2D layered materials with high-quality microwave quantum devices.

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Enrico, E., L. Croin, E. Strambini i F. Giazotto. "Single charge transport in a fully superconducting SQUISET locally tuned by self-inductance effects". AIP Advances 12, nr 5 (1.05.2022): 055122. http://dx.doi.org/10.1063/5.0084168.

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We present a single-electron device for the manipulation of charge states via quantum interference in nanostructured electrodes. Via self-inductance effects, we induce two independent magnetic fluxes in the electrodes and we demonstrate sensitivity to single charge states and magnetic field at variable temperature. Moreover, our approach allows us to demonstrate local and independent control of the single-particle conductance between nano-engineered tunnel junctions in a fully superconducting quantum interference single-electron transistor, thereby increasing the flexibility of our single-electron transistors. Our devices show a robust modulation of the current-to-flux transfer function via control currents while exploiting the single-electron filling of a mesoscopic superconducting island. Further applications of the device concept to single charge manipulation and magnetic-flux sensing are also discussed.

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Jiang, Junliang, Zishuo Li, Tingting Guo, Wenqu Xu, Xingyu Wei, Kaixuan Zhang, Tianshi Zhou i in. "Building compact superconducting microwave resonators with Hilbert space-filling curves". Applied Physics Letters 121, nr 25 (19.12.2022): 254001. http://dx.doi.org/10.1063/5.0128964.

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Superconducting quantum computing is currently one of the most promising platforms for universal quantum information processing. The readout resonator is an essential integral part of a superconducting qubit, while its size is much larger compared to the Josephson junction. We propose and realize a new readout resonator using space-filling curves, specifically Hilbert space-filling curves. We introduce the frequency analysis method and demonstrate a qubit sample, in which the Hilbert-space-filling-curves resonator (HSFCR) is used to read out the qubit states. We also propose to fabricate the HSFCRs and Josephson junctions simultaneously in the same processes of E-beam lithography and E-beam evaporation. Our design reduces the resonator area sufficiently and, thus, will help to improve the integration of superconducting qubits, as well as to design other superconducting quantum devices.

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Kurizki, Gershon, Patrice Bertet, Yuimaru Kubo, Klaus Mølmer, David Petrosyan, Peter Rabl i Jörg Schmiedmayer. "Quantum technologies with hybrid systems". Proceedings of the National Academy of Sciences 112, nr 13 (3.03.2015): 3866–73. http://dx.doi.org/10.1073/pnas.1419326112.

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An extensively pursued current direction of research in physics aims at the development of practical technologies that exploit the effects of quantum mechanics. As part of this ongoing effort, devices for quantum information processing, secure communication, and high-precision sensing are being implemented with diverse systems, ranging from photons, atoms, and spins to mesoscopic superconducting and nanomechanical structures. Their physical properties make some of these systems better suited than others for specific tasks; thus, photons are well suited for transmitting quantum information, weakly interacting spins can serve as long-lived quantum memories, and superconducting elements can rapidly process information encoded in their quantum states. A central goal of the envisaged quantum technologies is to develop devices that can simultaneously perform several of these tasks, namely, reliably store, process, and transmit quantum information. Hybrid quantum systems composed of different physical components with complementary functionalities may provide precisely such multitasking capabilities. This article reviews some of the driving theoretical ideas and first experimental realizations of hybrid quantum systems and the opportunities and challenges they present and offers a glance at the near- and long-term perspectives of this fascinating and rapidly expanding field.

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Guo, Hao Min, Xin Hua Li, Zhi Fei Zhao i Yu Qi Wang. "Tunable Ferromagnetism above Room-Temperature in Self-Assembled (In,Mn)As Diluted Magnetic Semiconductor Quantum Dots on Be-Doped Al_xGa_1-XAs Template by Molecular Beam Epitaxy". Advanced Materials Research 476-478 (luty 2012): 793–98. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.793.

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With the introduction of Be-doped AlxGa1-xAs template, self-assembled In0.79Mn0.21As quantum dots samples were prepared on semi-insulating (001) GaAs substrates by molecular beam epitaxy. High quantum dots density was confirmed by the atomic force microscopy. The ferromagnetism of the samples was revealed by superconducting quantum interference device magnetometer analysis at 10K, and the Curie temperatures ranging from 292 to 314K were able to be regulated by adjusting Al content and Be dopant in Be-doped AlxGa1-xAs templates, implying the feasible application of spintronic devices.

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Zhao, Shou-Kuan, Zi-Yong Ge, Zhong-Cheng Xiang, Guang-Ming Xue, Hai-Sheng Yan, Zi-Ting Wang, Zhan Wang i in. "Measuring Loschmidt echo via Floquet engineering in superconducting circuits". Chinese Physics B 31, nr 3 (1.03.2022): 030307. http://dx.doi.org/10.1088/1674-1056/ac40f8.

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The Loschmidt echo is a useful diagnostic for the perfection of quantum time-reversal process and the sensitivity of quantum evolution to small perturbations. The main challenge for measuring the Loschmidt echo is the time reversal of a quantum evolution. In this work, we demonstrate the measurement of the Loschmidt echo in a superconducting 10-qubit system using Floquet engineering and discuss the imperfection of an initial Bell-state recovery arising from the next-nearest-neighbor (NNN) coupling present in the qubit device. Our results show that the Loschmidt echo is very sensitive to small perturbations during quantum-state evolution, in contrast to the quantities like qubit population that is often considered in the time-reversal experiment. These properties may be employed for the investigation of multiqubit system concerning many-body decoherence and entanglement, etc., especially when devices with reduced or vanishing NNN coupling are used.

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Sun, Kuei, Zhi-qiang Bao, Wenlong Yu, Samuel D. Hawkins, John F. Klem, Wei Pan i Xiaoyan Shi. "Charge transport spectra in superconductor-InAs/GaSb-superconductor heterostructures". Nanotechnology 33, nr 8 (2.12.2021): 085703. http://dx.doi.org/10.1088/1361-6528/ac3a36.

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Abstract Charge transport physics in InAs/GaSb bi-layer systems has recently attracted attention for the experimental search for two-dimensional topological superconducting states in solids. Here we report measurement of charge transport spectra of nano devices consisting of an InAs/GaSb quantum well sandwiched by tantalum superconductors. We explore the current-voltage relation as a function of the charge-carrier density in the quantum well controlled by a gate voltage and an external magnetic field. We observe three types of differential resistance peaks, all of which can be effectively tuned by the external magnetic field, and, however, two of which appear at electric currents independent of the gate voltage, indicating a dominant mechanism from the superconductor and the system geometry. By analyzing the spectroscopic features, we find that the three types of peaks identify Andreev reflections, quasi-particle interference, and superconducting transitions in the device, respectively. Our results provide a basis for further exploration of possible topological superconducting state in the InAs/GaSb system.

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Suleiman, Mohammad, Martin F. Sarott, Morgan Trassin, Maria Badarne i Yachin Ivry. "Nonvolatile voltage-tunable ferroelectric-superconducting quantum interference memory devices". Applied Physics Letters 119, nr 11 (13.09.2021): 112601. http://dx.doi.org/10.1063/5.0061160.

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Polak, T. P., i E. Sarnelli. "Self-Induced Resonances in Asymmetric Superconducting Quantum Interference Devices". Acta Physica Polonica A 114, nr 1 (lipiec 2008): 203–7. http://dx.doi.org/10.12693/aphyspola.114.203.

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Koch, R. H., C. P. Umbach, G. J. Clark, P. Chaudhari i R. B. Laibowitz. "Quantum interference devices made from superconducting oxide thin films". Applied Physics Letters 51, nr 3 (20.07.1987): 200–202. http://dx.doi.org/10.1063/1.98922.

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