Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

International Journal of Modern Physics B

SUPERPOSITIONS OF COHERENT STATES AND SQUEEZING EFFECTS IN A MESOSCOPIC JOSEPHSON JUNCTION

Jian Zou, Bin Shao

Published Mar 30, 1999• 10 citations
Publisher

Abstract

We consider a mesoscopic Josephson junction in a circular superconducting ring which encloses a magneto static flux. It is shown that with the junction being initially prepared in its lowest energy level the state of the junction can evolve in a quantum superposition of two coherent states, and squeezing can exist in such system.
DOI
10.1142/s021797929900076x

Related papers

Quantum Superposition of Two Coherent States in a Mesoscopic Josephson Junction

Zou Jian, Shao Bin

We study a mesoscopic Josephson junction in a circular superconducting ring which encloses a magneto static flux. It is shown that with the junction being initially prepared in vacuum state, the state of the junction can evolve into a quantum superposition of two coherent states.

Communications in Theoretical Physics•Mar 15, 2000•1 citation

Quantum coherence in a mesoscopic Josephson junction with dissipation

Jian Zou, Bin Shao

A mesoscopic Josephson junction in a superconducting ring enclosing a magnetostatic flux with dissipation is considered. The dissipation in this system is described as a consequence of its coupling to a reservoir. By solving the master equation it is shown that the state of the junction can evolve into a quantum superposition of two coherent states even when the dissipation is present. It is also shown that squeezing effects can exist in such a system, and the dynamic behavior of the supercurrent shows collapse and revival phenomena. The quantum decoherence is also discussed.

Physical review. B, Condensed matter•Jun 18, 2001•2 citations

INTERACTION OF MESOSCOPIC JOSEPHSON JUNCTION WITH A SUCCESSIVE SQUEEZED COHERENT FIELD

Vasile A. Popescu

Signal-to-quantum noise ratio for quantum current in mesoscopic Josephson junction of a circular superconducting ring can be improved if the electromagnetic field is in a successive squeezed coherent state. The mesoscopic Josephson junctions can feel the difference between the successive squeezed coherent states and other types of squeezed coherent states because their current–voltage Shapiro steps are different. We compare our method with another procedure for superposition of two squeezed coherent states (a squeezed even coherent state) and consider the effect of different large inductances on the supercurrent.

Modern Physics Letters B•Jul 10, 2000•0 citations

Periodic Revivals of Squeezing in a Mesoscopic Josephson Junction

Jian Zou, Bin Shao

The interaction between a mesoscopic Josephson junction and a quantized electromagnetic field is discussed quantum mechanically. Within the external field approximation, it is shown that if the field is prepared in a coherent state and the junction is initially in its lowest energy level, squeezing can occur in such a system.

Chinese Physics Letters•Jun 1, 1999•2 citations

Squeezing Properties in Mesoscopic Josephson Junction with Nonclassical Radiation Field

Shao Bin, Zou Jian, Qian‐Shu Li

We consider a system of mesoscopic Josephson junction interacting with nonclassical radiation field and investigate any order squeezing for the mesoscopic Josephson junction subsystem. Our results show that if the field is initially prepared in a squeezed vacuum and the junction is in its lowest energy state (the vacuum state), then as the time evolves the Josephson junction subsystem can exhibit any order squeezing.

Modern Physics Letters B•Jul 10, 1998•7 citations

Quantum Fluctuation Properties in Mesoscopic Josephson Junction

Zou Jian

An effective bosonic Hamiltonian describing the interaction of a mesoscopic Josephson junction with a quantized radiation field is studied. It is shown that when the field is initially in a coherent state and the junction initially in its lowest energy level state, the state of the coupled field-mesoscopic Josephson junction system can evolve to a squeezed state. A detailed analysis about the quantum fluctuation of the coupled system is given.

北京理工大学学报：英文版•Jan 1, 2002•0 citations
A mesoscopic Josephson junction in a superconducting ring enclosing a magnetostatic flux with dissipation is considered. The dissipation in this system is described as a consequence of its coupling to a reservoir. By solving the master equation it is shown that the state of the junction can evolve into a quantum superposition of two coherent states even when the dissipation is present. It is also shown that squeezing effects can exist in such a system, and the dynamic behavior of the supercurrent shows collapse and revival phenomena. The quantum decoherence is also discussed.
Signal-to-quantum noise ratio for quantum current in mesoscopic Josephson junction of a circular superconducting ring can be improved if the electromagnetic field is in a successive squeezed coherent state. The mesoscopic Josephson junctions can feel the difference between the successive squeezed coherent states and other types of squeezed coherent states because their current–voltage Shapiro steps are different. We compare our method with another procedure for superposition of two squeezed coherent states (a squeezed even coherent state) and consider the effect of different large inductances on the supercurrent.