Charge quantum interference device

Graaf, S. E. de; Skacel, Sebastian T.; Hönigl-Decrinis, T.; Shaikhaidarov, R.; Rotzinger, Hannes; Linzen, S.; Ziegler, Mario; Hübner, Uwe; Meyer, H.‐G.; Antonov, V. N.; Il’ichev, E.; Ustinov, A. V.; Tzalenchuk, Alexander; Astafiev, O.

doi:10.1038/s41567-018-0097-9

Cited by 65 publications

(58 citation statements)

References 42 publications

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“…Recently, the time-reversal symmetry broken WSM phase has been proposed theoretically 6,14,22-25 and confirmed experimentally [63][64][65] in many realistic systems. Among these candidates, the magnetic Heusler alloys 22 and tetragonal-structured compounds 23 , which host only a single pair of largely separated Weyl nodes, may provide promising platforms to detect our predictions.…”

Section: Conclusion and Discussionmentioning

confidence: 86%

Influence of a chiral chemical potential on Weyl hybrid junctions

et al. 2019

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We study the transport properties and superconducting proximity effect in NSN junctions formed by a time-reversal symmetry broken Weyl semimetal (WSM) in proximity to an s-wave superconductor. We find that the differential conductances and induced pairing amplitudes strongly depend on the angle between the junction direction in real space and the axis separating the Weyl nodes in momentum space. We identify the influence of a chiral chemical potential, i.e., the electron population imbalance between Weyl nodes of opposite chirality, on the transport characteristics of the junction. Remarkably, we observe a net spin polarization of Cooper pairs that are generated via Andreev reflection in the two WSM regions. The spin polarization is opposite in the two WSM regions and highly sensitive to the chirality imbalance and excitation energy. arXiv:1903.06229v2 [cond-mat.supr-con]

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Section: Conclusion and Discussionmentioning

confidence: 86%

Influence of a chiral chemical potential on Weyl hybrid junctions

et al. 2019

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“…We want to emphasize that our device made of multiple nanowire junctions is certainly a nontrivial extension of the previously considered single junction for a phaseslip flux qubit [11,13] or double junctions used for charge quantum interference device [28,29]. In sharp contrast to these previous works, our consideration of multiple junctions allows the demonstration of highly nontrivial effects due to the asymmetric configurations as presented in our work.…”

Section: Discussionmentioning

confidence: 88%

“…In particular the demonstration of Aharonov-Casher interference in a system of many Josephson junctions in a recent experiment indicates that charges on the islands of the Josephson chain can be controlled with a sufficient precision and therefore are stable enough to enable the chain's collective behavior to be observed at the time scale needed for the measurement [34]. These examples together with the experimental realization of a charge quantum interference device [28] suggest that the charge fluctuations and charge noise on islands may be sufficiently small for a realization of our proposed multi-junction phase-slip flux qubit.…”

Section: Discussionmentioning

confidence: 95%

“…This gives rise to ineffective gating and the charge fluctuations on inhomogeneities increase the decoherence of a qubit. However, the recent experimental realization of a charge quantum interference device that contains an island which separates two junctions indicates that the inhomogeneities are possibly not strong enough to destroy the coherence [28].…”

Section: Discussionmentioning

confidence: 99%

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Collective quantum phase slips in multiple nanowire junctions

Lam

et al. 2019

Phys. Rev. A

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Realization of robust coherent quantum phase slips represents a significant experimental challenge. Here we propose a new design consisting of multiple nanowire junctions to realize a phase-slip flux qubit. It admits good tunability provided by gate voltages applied on superconducting islands separating nanowire junctions. In addition, the gates and junctions can be identical or distinct to each other leading to symmetric and asymmetric setups. We find that the asymmetry can improve the performance of the proposed device, compared with the symmetric case. In particular, it can enhance the effective rate of collective quantum phase slips. Furthermore, we demonstrate how to couple two such devices via a mutual inductance. This is potentially useful for quantum gate operations. Our investigation on how symmetry in multiple nanowire junctions affects the device performance should be useful for the application of phase-slip flux qubits in quantum information processing and quantum metrology.

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“…Quantum phase-slip phenomenon has been identified as an exact dual to Josephson tunneling based on charge-flux duality [8]. Several applications of quantum phase-slip junctions (QPSJs) were proposed based on this duality, such as in qubits [9], [10], current standards [11] and other similar applications [12], [13], [14]. We have explored the use of QPSJs in circuits by establishing their operation in producing a quantized charge of 2e in the form of a current pulse with Uday S. Goteti constant area during a single switching event, akin to singleflux quantum generation in a JJ [15], [16].…”

Section: Introductionmentioning

confidence: 99%

Complementary Quantum Logic Family Using Josephson Junctions and Quantum Phase-Slip Junctions

Goteti

Hamilton

2019

IEEE Trans. Appl. Supercond.

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In this article, we explore a new set of circuits, that incorporate both single-flux-quantum and quantized chargebased complementary quantum logic circuits. Circuits that convert single-flux quantum voltage pulses to quantized charge pulses and vice versa are introduced that lead to circuits that simplify logic and integration operations of individual flux and charge based logic circuits. These include fan-out circuits that enable single flux input to several charge outputs and control gate circuit with charge input controlling flux output. The operation of these circuits is demonstrated in simulations using WRSPICE. An XOR gate implementation is presented as an example to illustrate the operation of these circuits. The developed complementary quantum logic circuits show promise for higher power efficiency and simpler design in the form of fewer junctions for a given logic implementation, leading to the possibility of higher integration density.

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Charge quantum interference device

Cited by 65 publications

References 42 publications

Influence of a chiral chemical potential on Weyl hybrid junctions

Influence of a chiral chemical potential on Weyl hybrid junctions

Collective quantum phase slips in multiple nanowire junctions

Complementary Quantum Logic Family Using Josephson Junctions and Quantum Phase-Slip Junctions

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