HIGHER-ORDER SQUEEZING DEGREE IN MESOSCOPIC JOSEPHSON JUNCTION IN THE PRESENCE OF NONCLASSICAL RADIATION FIELD

2000 ◽  
Vol 14 (06) ◽  
pp. 203-209 ◽  
Author(s):  
V. A. POPESCU
Keyword(s):  
Electromagnetic Field ◽  
Josephson Junction ◽  
Radiation Field ◽  
Vacuum State ◽  
Higher Order ◽  
Squeezed Vacuum State ◽  
Usual Procedure ◽  
Superconducting Ring ◽  
Squeezed Vacuum ◽  
Quantum Current

Higher-order squeezing degree in mesoscopic Josephson junction of a circular superconducting ring can be improved if the electromagnetic field is initially in a successive squeezed vacuum state. We compare our method with the usual procedure for higher-order squeezing and consider the effect of different small inductances on the 2Nth-order squeezing degree for quantum current.

Test of Inseparability Criteria for Squeezed Number States of the Radiation Field

2006 ◽  
Vol 13 (04) ◽  
pp. 383-392 ◽  
Author(s):  
Fabio Dell'Anno ◽  
Silvio De Siena ◽  
Fabrizio Illuminati
Keyword(s):  
Electromagnetic Field ◽  
Radiation Field ◽  
Higher Order ◽  
Statistical Moments ◽  
Gaussian States ◽  
Squeezed Vacuum ◽  
Non Gaussian ◽  
Ppt Criterion ◽  
Relevant Class

We investigate the efficiency of inseparability criteria in detecting the entanglement properties of two-mode non-Gaussian states of the electromagnetic field. We focus our study on the relevant class of two-mode squeezed number states. These states combine the entangling capability of two-mode squeezers with the non-Gaussian character (nonclassicality) of number states. They allow for some exact analytical treatments, and include as a particular case the two-mode Gaussian squeezed vacuum. We show that the generalized PPT criterion recently proposed by Shchukin and Vogel, based on higher order statistical moments, is very efficient in detecting the entanglement for this class of non-Gaussian states.

SQUEEZING PROPERTIES OF COUPLED NONLINEAR OSCILLATORS

1990 ◽  
Vol 04 (04) ◽  
pp. 659-676 ◽  
Author(s):  
VLADIMÍR BUŽEK ◽  
IGOR JEX
Keyword(s):  
Coherent State ◽  
Time Evolution ◽  
Radiation Field ◽  
Anharmonic Oscillator ◽  
Nonlinear Oscillators ◽  
Vacuum State ◽  
Squeezed Vacuum State ◽  
Squeezed Vacuum ◽  
Coupled Nonlinear Oscillators ◽  
High Degree

In this paper the squeezing properties of the two-mode radiation field interacting with a nonliner nonabsorbing Kerr-like medium modelled as a two-mode anharmonic oscillator are studied. Time evolution of the variances of the radiation field initially prepared in the two-mode coherent state as well as the two-mode squeezed vacuum state are analyzed. In particular, it is shown that in the case when the radiation field is initially prepared in the two-mode coherent state the interaction between two modes leads to a high degree of squeezing.

Squeezing Properties in Mesoscopic Josephson Junction with Nonclassical Radiation Field

1998 ◽  
Vol 12 (16) ◽  
pp. 623-631 ◽  
Author(s):  
Shao Bin ◽  
Zou Jian ◽  
Li Qian-Shu
Keyword(s):  
Josephson Junction ◽  
Radiation Field ◽  
Energy State ◽  
Vacuum State ◽  
Squeezed Vacuum

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.

scholarly journals Non-classical properties and generation schemes of superposition of multiple-photon-added two-mode squeezed vacuum state

2021 ◽  
Vol 130 (1B) ◽  
pp. 5-12
Author(s):  
Tran Quang Dat ◽  
Truong Minh Thang ◽  
Truong Minh Duc
Keyword(s):  
Wigner Function ◽  
Vacuum State ◽  
Optical Devices ◽  
Higher Order ◽  
Gaussian State ◽  
Squeezed Vacuum State ◽  
Squeezed Vacuum ◽  
The Difference ◽  
Non Gaussian ◽  
Usual Order

In this paper, we study some non-classical properties and propose the generation schemes of the superposition of multiple-photon-added two-mode squeezed vacuum state (SMPA-TMSVS). Based on the   Wigner function, we clarify that this state is a non-Gaussian state, while the original two-mode squeezed vacuum state (TMSVS) is a Gaussian state. Besides, the SMPA-TMSVS is sum squeezing, as well as difference squeezing. In particular, the manifestation of the sum squeezing and the difference squeezing in the SMPA-TMSVS becomes more pronounced when increasing parameters r and e. In addition, by exploiting the schemes of photon-added superposition in the usual order, we give some schemes that the SMPA-TMSVS can be generated with the higher-order photon-added superposition by using some optical devices.

INTERACTION OF MESOSCOPIC JOSEPHSON JUNCTION WITH A SUCCESSIVE SQUEEZED COHERENT FIELD

2000 ◽  
Vol 14 (16) ◽  
pp. 609-618
Author(s):  
V. A. POPESCU
Keyword(s):  
Coherent State ◽  
Josephson Junction ◽  
Coherent States ◽  
Quantum Noise ◽  
Shapiro Steps ◽  
Superconducting Ring ◽  
Coherent Field ◽  
Current Voltage ◽  
Quantum Current ◽  
The Difference

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.

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