Development of a Josephson vortex two-state system based on a confocal annular Josephson junction

Roberto Monaco*, Jesper Mygind, Valery P. Koshelets

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

We report theoretical and experimental work on the development of a Josephson vortex two-state system based on a confocal annular Josephson tunnel junction (CAJTJ). The key ingredient of this geometrical configuration is a periodically variable width that generates a spatial vortex potential with bistable states. This intrinsic vortex potential can be tuned by an externally applied magnetic field and tilted by a bias current. The two-state system is accurately modeled by a one-dimensional sine-Gordon like equation by means of which one can numerically calculate both the magnetic field needed to set the vortex in a given state as well as the vortex-depinning currents. Experimental data taken at on high-quality Nb/Al–AlOx/Nb CAJTJs with an individual trapped fluxon advocate the presence of a robust and finely tunable double-well potential for which reliable manipulation of the vortex state has been classically demonstrated. The vortex is prepared in a given potential by means of an externally applied magnetic field, while the state readout is accomplished by measuring the vortex-depinning current in a small magnetic field. Our proof of principle experiment convincingly demonstrates that the proposed vortex two-state system based on CAJTJs is robust and workable.
Original languageEnglish
Article number025003
JournalSuperconductor Science and Technology
Volume31
Issue number2
Number of pages15
ISSN0953-2048
DOIs
Publication statusPublished - 2018

Keywords

  • Josephson devices
  • Quantum computation
  • Solitons
  • Mesoscopic and nanoscale systems

Cite this

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title = "Development of a Josephson vortex two-state system based on a confocal annular Josephson junction",
abstract = "We report theoretical and experimental work on the development of a Josephson vortex two-state system based on a confocal annular Josephson tunnel junction (CAJTJ). The key ingredient of this geometrical configuration is a periodically variable width that generates a spatial vortex potential with bistable states. This intrinsic vortex potential can be tuned by an externally applied magnetic field and tilted by a bias current. The two-state system is accurately modeled by a one-dimensional sine-Gordon like equation by means of which one can numerically calculate both the magnetic field needed to set the vortex in a given state as well as the vortex-depinning currents. Experimental data taken at on high-quality Nb/Al–AlOx/Nb CAJTJs with an individual trapped fluxon advocate the presence of a robust and finely tunable double-well potential for which reliable manipulation of the vortex state has been classically demonstrated. The vortex is prepared in a given potential by means of an externally applied magnetic field, while the state readout is accomplished by measuring the vortex-depinning current in a small magnetic field. Our proof of principle experiment convincingly demonstrates that the proposed vortex two-state system based on CAJTJs is robust and workable.",
keywords = "Josephson devices, Quantum computation, Solitons, Mesoscopic and nanoscale systems",
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language = "English",
volume = "31",
journal = "Superconductor Science & Technology",
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Development of a Josephson vortex two-state system based on a confocal annular Josephson junction. / Monaco, Roberto; Mygind, Jesper; Koshelets, Valery P.

In: Superconductor Science and Technology, Vol. 31, No. 2, 025003, 2018.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Development of a Josephson vortex two-state system based on a confocal annular Josephson junction

AU - Monaco, Roberto

AU - Mygind, Jesper

AU - Koshelets, Valery P.

PY - 2018

Y1 - 2018

N2 - We report theoretical and experimental work on the development of a Josephson vortex two-state system based on a confocal annular Josephson tunnel junction (CAJTJ). The key ingredient of this geometrical configuration is a periodically variable width that generates a spatial vortex potential with bistable states. This intrinsic vortex potential can be tuned by an externally applied magnetic field and tilted by a bias current. The two-state system is accurately modeled by a one-dimensional sine-Gordon like equation by means of which one can numerically calculate both the magnetic field needed to set the vortex in a given state as well as the vortex-depinning currents. Experimental data taken at on high-quality Nb/Al–AlOx/Nb CAJTJs with an individual trapped fluxon advocate the presence of a robust and finely tunable double-well potential for which reliable manipulation of the vortex state has been classically demonstrated. The vortex is prepared in a given potential by means of an externally applied magnetic field, while the state readout is accomplished by measuring the vortex-depinning current in a small magnetic field. Our proof of principle experiment convincingly demonstrates that the proposed vortex two-state system based on CAJTJs is robust and workable.

AB - We report theoretical and experimental work on the development of a Josephson vortex two-state system based on a confocal annular Josephson tunnel junction (CAJTJ). The key ingredient of this geometrical configuration is a periodically variable width that generates a spatial vortex potential with bistable states. This intrinsic vortex potential can be tuned by an externally applied magnetic field and tilted by a bias current. The two-state system is accurately modeled by a one-dimensional sine-Gordon like equation by means of which one can numerically calculate both the magnetic field needed to set the vortex in a given state as well as the vortex-depinning currents. Experimental data taken at on high-quality Nb/Al–AlOx/Nb CAJTJs with an individual trapped fluxon advocate the presence of a robust and finely tunable double-well potential for which reliable manipulation of the vortex state has been classically demonstrated. The vortex is prepared in a given potential by means of an externally applied magnetic field, while the state readout is accomplished by measuring the vortex-depinning current in a small magnetic field. Our proof of principle experiment convincingly demonstrates that the proposed vortex two-state system based on CAJTJs is robust and workable.

KW - Josephson devices

KW - Quantum computation

KW - Solitons

KW - Mesoscopic and nanoscale systems

U2 - 10.1088/1361-6668/aa9e17

DO - 10.1088/1361-6668/aa9e17

M3 - Journal article

VL - 31

JO - Superconductor Science & Technology

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