Nonclassicality of the photon addition-then-subtraction coherent state and its decoherence in the photon-loss channel

2011 ◽  
Vol 28 (8) ◽  
pp. 1964 ◽  
Author(s):  
Zhen Wang ◽  
Hong-chun Yuan ◽  
Hong-yi Fan
Keyword(s):  
Coherent State ◽  
Photon Loss ◽  
Photon Addition

Entanglement and nonlocality for a mixture of a pair-coherent state

2003 ◽  
Vol 3 (2) ◽  
pp. 106-115
Author(s):  
S. Mancini ◽  
P. Tombesi
Keyword(s):  
Coherent State ◽  
Quantum Teleportation ◽  
Single Photon ◽  
Continuous Variables ◽  
Bell’S Inequalities ◽  
Nonclassical Properties ◽  
Pair Coherent State ◽  
Photon Loss ◽  
Phase Randomization ◽  
Degree Of Entanglement

We consider a bipartite continuous variables quantum mixture coming from phase randomization of a pair-coherent state. We study the nonclassical properties of such a mixture. In particular, we quantify its degree of entanglement, then we show possible violations of Bell's inequalities. We also consider the use of this mixture in quantum teleportation. Finally, we compare this mixture with that obtained from a pair-coherent state by single photon loss.

Induced States from Coherent State via Photon-Addition Operations

2019 ◽  
Vol 58 (6) ◽  
pp. 1908-1926 ◽  
Author(s):  
Hong-Chun Yuan ◽  
Xue-Xiang Xu ◽  
Jian-Wen Cai ◽  
Ye-Jun Xu ◽  
Xiang-Guo Meng
Keyword(s):  
Coherent State ◽  
Photon Addition

Nearly deterministic controlled-NOT gate with weak cross-Kerr nonlinearities

2012 ◽  
Vol 12 (1&2) ◽  
pp. 159-170
Author(s):  
Xiao-Ming Xiu ◽  
Li Dong ◽  
Ya-Jun Gao ◽  
X. X. Yi
Keyword(s):  
Coherent State ◽  
Success Probability ◽  
Displacement Measurement ◽  
Quantum Gate ◽  
Optical Elements ◽  
Feed Forward ◽  
Quantum Nondemolition ◽  
Signal Photon ◽  
Photon Loss ◽  
Target Output

On the basis of the probe coherent state and weak cross-Kerr nonlinearities, we present a scheme of a nearly deterministic Controlled-NOT gate. In this construction, feed-forward methods, quantum nondemolition detectors and several optical elements are applied. It is a potentially practical quantum gate with certain features. First, the lack of auxiliary photons is allowable, which decreases consumption of resources. Secondly, employment of the signal photon from either of target output ports and three quantum nondemolition detectors enable the success probability to approach unit and judge whether the signal photons lose or not. Thirdly, the displacement measurement is adopted, and thus the Controlled-NOT gate works against photon loss of the probe coherent state. Finally, in order to circumvent the effect of dephasing, the monochromatic signal photons are exploited.

scholarly journals HIGHER-ORDER NONCLASSICAL AND ENTANGLEMENT PROPERTIES IN PHOTON-ADDED TRIO COHERENT STATE

2020 ◽  
Vol 129 (1B) ◽  
Author(s):  
Quang Dat Tran ◽  
Minh Duc Truong
Keyword(s):  
Coherent State ◽  
Single Mode ◽  
Higher Order ◽  
Photon Addition

<p>This paper studies the higher-order nonclassical and entanglemet properties in the photon-added trio coherent state (PATCS). We use the criterion of higher-order single-mode antibunching to evaluate the role of photon addition operation. Moreover, the general criteria for detection of higher-order three-mode sum squeezing and entanglement features in the PATCS are also investigated. The results show that the photon addition operation to a trio coherent state can enhance the degree of both the higher-order single-mode antibunching and the higher-order three-mode sum squeezing, and enlarge the value of higher-order three-mode entanglement factor in the PATCS. In addition,  the manifestation of the single-mode antibunching and the entanglement properties are more obvious with increasing the higher values of orders.</p>

scholarly journals Higher-order nonclassical and entanglement properties in photon-added trio coherent state

2020 ◽  
Vol 129 (1B) ◽  
pp. 49-55
Author(s):  
Tran Quang Dat ◽  
Truong Minh Duc
Keyword(s):  
Coherent State ◽  
Single Mode ◽  
Higher Order ◽  
Photon Addition

This paper studies the higher-order nonclassical and entanglement properties in the photon-added trio coherent state (PATCS). We use the criterion of higher-order single-mode antibunching to evaluate the role of the photon addition operation. Furthermore, the general criteria for detection of higher-order three-mode sum squeezing and entanglement features in the PATCS are also investigated. The results show that the photon addition operation to a trio coherent state can enhance the degree of both the higher-order single-mode antibunching and the higher-order three-mode sum squeezing and enlarge the value of the higher-order three-mode entanglement factor in the photon-added trio coherent state. In addition, the manifestation of the single-mode antibunching and the entanglement properties are more obvious with increasing the higher values of orders.

Orthogonalization of coherent state and generation of continuous-variable qubit state via a coherent superposition of photon addition and subtraction

2018 ◽  
Vol 33 (30) ◽  
pp. 1850172 ◽  
Author(s):  
Jian-Ming Wang ◽  
Xue-Xiang Xu
Keyword(s):  
Coherent State ◽  
Photon Number ◽  
Continuous Variable ◽  
Quantum States ◽  
Qubit State ◽  
Orthogonal State ◽  
The Mean ◽  
Q Function ◽  
Special Case ◽  
Photon Addition

Based on the coherent state (S1) and the operator [Formula: see text], we induce other three quantum states (here we abbreviate them as S2, S3 and S4). S2 is obtained by operating the operator on S1 directly. S3 is an orthogonal state of S1 constructed from the orthogonalizer relevant with that operator. S4 is a continuous-variable (CV) qubit state superposed from S1 and S3. We study and compare the mathematical and physical properties of such four quantum states. We demonstrate some statistical properties for S1–S4, including the mean photon number (MPN), anti-bunching effect, quadrate squeezing, photon number distribution, Husimi Q-function and Wigner function. The numerical results show some interesting non-classical characters for such states. It is worthy to note that the photon-added coherent state introduced by Agarwal and Tara is only a special case of our considered states.

Improvement of Quasi-Optimum Quantum Receiver for 3-PSK Coherent-State Signals

2009 ◽  
Vol 129 (12) ◽  
pp. 2159-2160
Author(s):  
Asami Imaeda ◽  
Masahiro Yoshikawa ◽  
Tsuyoshi Sasaki
Keyword(s):  
Coherent State

Quasi coherent state of the Dirac oscillator

2021 ◽  
Vol 68 (1) ◽  
pp. 56-62
Author(s):  
P. Ghosh ◽  
P. Roy
Keyword(s):  
Coherent State ◽  
Dirac Oscillator

scholarly journals Generating Discorrelated States for Quantum Information Protocols by Coherent Multimode Photon Addition

2021 ◽  
pp. 2000141
Author(s):  
Nicola Biagi ◽  
Luca S. Costanzo ◽  
Marco Bellini ◽  
Alessandro Zavatta
Keyword(s):  
Quantum Information ◽  
Photon Addition

scholarly journals Procedure via cross-Kerr nonlinearities for encoding single logical qubit information onto four-photon decoherence-free states

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jino Heo ◽  
Seong-Gon Choi
Keyword(s):  
Quantum Information ◽  
Quantum Information Processing ◽  
Photon Number ◽  
Optical Devices ◽  
Quantum Bus ◽  
Reliable Procedure ◽  
Optical Gates ◽  
Photon Loss ◽  
Decoherence Effect ◽  
Logical Qubit

AbstractWe propose a photonic procedure using cross-Kerr nonlinearities (XKNLs) to encode single logical qubit information onto four-photon decoherence-free states. In quantum information processing, a decoherence-free subspace can secure quantum information against collective decoherence. Therefore, we design a procedure employing nonlinear optical gates, which are composed of XKNLs, quantum bus beams, and photon-number-resolving measurements with linear optical devices, to conserve quantum information by encoding quantum information onto four-photon decoherence-free states (single logical qubit information). Based on our analysis in quantifying the affection (photon loss and dephasing) of the decoherence effect, we demonstrate the experimental condition to acquire the reliable procedure of single logical qubit information having the robustness against the decoherence effect.

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