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The role of dissipation in quantum phase slip production in superconducting nanowires

Dmitry Mozyrsky

Bulletin of the American Physical SocietyFeb 28, 20120 citations

The Quantum Phase Slip Phenomenon in Superconducting Nanowires with High-Impedance Environment

K. Yu. Arutyunov, J. S. Lehtinen, T. Rantala

arXiv:1602.07935Journal of Superconductivity and Novel MagnetismDec 14, 201516 citations

Quantum Phase Slips in 1D Josephson Junction arrays

Jack Lidmar

Bulletin of the American Physical SocietyMar 14, 20080 citations

Arrays of Coupled Superconducting Nanowires

Andrei Ursache, Michael Thorn, James T. Goldbach +2 more

APSMar 1, 20030 citations

Collective quantum phase slips in multiple nanowire junctions

Zeng-Zhao Li, Tie-Fu Li, Chi‐Hang Lam +1 more

Realization of robust coherent quantum phase slips represents a significant experimental challenge. Here we propose a 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 to or distinct from 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.Realization of robust coherent quantum phase slips represents a significant experimental challenge. Here we propose a 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 to or distinct from 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.

arXiv:1406.6815Physical Review AJan 8, 20198 citations

Coherent Quantum Phase-Slips in Superconducting Nanowires in DC Transport

JC Fenton, Jonathan Burnett

The phenomenon of coherent quantum phase-slips (CQPS) in superconducting nanowires was some time ago proposed to be the exact dual of the Josephson effect, a proposal accompanied by predictions of a new quantum current standard dual to the Josephson voltage standard. Unambiguous experimental observation of CQPS in nanowire structures has only recently been achieved through microwave spectroscopy which showed an avoided crossing between flux states for a superconducting ring interrupted by a superconducting nanowire. This observation raises expectations that the CQPS quantum current standard and a slew of CQPS devices dual to devices containing Josephson junction might be realised, including a tunable capacitance, a sensitive charge detector and small-signal detector. To date, experimental evidence for CQPS in a dc transport geometry has not been considered conclusive, and the impact of decoherence in CQPS devices still remains to be evaluated. We present experimental work which has enabled us to crystallise pertinent issues which have prevented the realisation of CQPS in dc transport experiments to date.The phenomenon of coherent quantum phase-slips (CQPS) in superconducting nanowires was some time ago proposed to be the exact dual of the Josephson effect, a proposal accompanied by predictions of a new quantum current standard dual to the Josephson voltage standard. Unambiguous experimental observation of CQPS in nanowire structures has only recently been achieved through microwave spectroscopy which showed an avoided crossing between flux states for a superconducting ring interrupted by a superconducting nanowire. This observation raises expectations that the CQPS quantum current standard and a slew of CQPS devices dual to devices containing Josephson junction might be realised, including a tunable capacitance, a sensitive charge detector and small-signal detector. To date, experimental evidence for CQPS in a dc transport geometry has not been considered conclusive, and the impact of decoherence in CQPS devices still remains to be evaluated. We present experimental work which has enabled us to crystallise pertinent issues which have prevented the realisation of CQPS in dc transport experiments to date.

Aug 7, 20140 citations

Collective Quantum Phase-Slip Dynamics in Superconducting Nanowire Arrays

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