Quantum Properties of the State via Operation of Superposition of Photon Subtraction Two Times and Photon Addition Two Times on Two Modes Squeezing Vacuum State

2018 ◽  
Vol 57 (9) ◽  
pp. 2767-2774
Author(s):  
Dao-Ming Lu
Keyword(s):  
Vacuum State ◽  
The State ◽  
Quantum Properties ◽  
Photon Subtraction ◽  
Photon Addition

scholarly journals Gaussian and Non-Gaussian operations on non-Gaussian state: engineering non-Gaussianity

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
Stefano Olivares ◽  
Alessia Allevi ◽  
Maria Bondani
Keyword(s):  
Coherent State ◽  
Direct Detection ◽  
The State ◽  
Gaussian State ◽  
Classical State ◽  
Phase Sensitive ◽  
Photon Subtraction ◽  
Non Gaussian

AbstractMultiple photon subtraction applied to a displaced phase-averaged coherent state, which is a non-Gaussian classical state, produces conditional states with a non trivial (positive) Glauber-Sudarshan Prepresentation. We theoretically and experimentally demonstrate that, despite its simplicity, this class of conditional states cannot be fully characterized by direct detection of photon numbers. In particular, the non-Gaussianity of the state is a characteristics that must be assessed by phase-sensitive measurements. We also show that the non-Gaussianity of conditional states can be manipulated by choosing suitable conditioning values and composition of phase-averaged states.

Photon subtraction from a multimode squeezed vacuum state

2017 ◽  
Author(s):  
Adrien Dufour ◽  
Clément Jacquard ◽  
Young-Sik Ra ◽  
Claude Fabre ◽  
Nicolas Treps
Keyword(s):  
Vacuum State ◽  
Squeezed Vacuum State ◽  
Squeezed Vacuum ◽  
Photon Subtraction

Single-mode squeezed vacuum state orthogonalization via photon-addition operation

Optik ◽  
2019 ◽  
Vol 183 ◽  
pp. 1043-1047
Author(s):  
Hong-Chun Yuan ◽  
Xue-Xiang Xu ◽  
Jian-Wen Cai ◽  
Ye-Jun Xu
Keyword(s):  
Single Mode ◽  
Vacuum State ◽  
Squeezed Vacuum State ◽  
Squeezed Vacuum ◽  
Photon Addition

scholarly journals Temperature of a decoherent oscillator with strong coupling

2012 ◽  
Vol 370 (1975) ◽  
pp. 4460-4468 ◽  
Author(s):  
W. G. Unruh
Keyword(s):  
Density Matrix ◽  
Strong Coupling ◽  
Thermal State ◽  
Heat Bath ◽  
Vacuum State ◽  
The State ◽  
Reduced Density Matrix ◽  
Actual Temperature ◽  
Reduced Density

The temperature of an oscillator coupled to the vacuum state of a heat bath via Ohmic coupling is non-zero, as measured by the reduced density matrix of the oscillator. This study shows that the actual temperature, as measured by a thermometer, is still zero (or, in the thermal state of the bath, the temperature of the bath). The decoherence temperature is due to ‘false-decoherence’, with a correlation between the oscillator and the heat bath causing the decoherence, but the heat baths state dragged along with the state of the oscillator.

scholarly journals Quantum Contextual Advantage Depending on Nonzero Prior Probabilities in State Discrimination of Mixed Qubit States

Entropy ◽  
2021 ◽  
Vol 23 (12) ◽  
pp. 1583
Author(s):  
Jaehee Shin ◽  
Donghoon Ha ◽  
Younghun Kwon
Keyword(s):  
Prior Probability ◽  
The State ◽  
Mixed States ◽  
Minimum Error ◽  
Prior Probabilities ◽  
Quantum Properties ◽  
State Discrimination ◽  
The Given ◽  
Qubit States ◽  
Selection Of

Recently, Schmid and Spekkens studied the quantum contextuality in terms of state discrimination. By dealing with the minimum error discrimination of two quantum states with identical prior probabilities, they reported that quantum contextual advantage exists. Meanwhile, if one notes a striking observation that the selection of prior probability can affect the quantum properties of the system, it is necessary to verify whether the quantum contextual advantage depends on the prior probabilities of the given states. In this paper, we consider the minimum error discrimination of two states with arbitrary prior probabilities, in which both states are pure or mixed. We show that the quantum contextual advantage in state discrimination may depend on the prior probabilities of the given states. In particular, even though the quantum contextual advantage always exists in the state discrimination of two nonorthogonal pure states with nonzero prior probabilities, the quantum contextual advantage depends on prior probabilities in the state discrimination of two mixed states.

Sign in / Sign up

Export Citation Format

Share Document