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Generation of continuous-variable quadripartite square cluster state and its entanglement improvement via quantum feedback
quantum optics continuous variable cluster state feedback
2011/12/15
In this paper, we investigate the generation of continuous-variable quadripartite square cluster state of optical fields and discuss the enhancement of the multipartite entanglement of the cluster sta...
Continuous variable quantum key distribution in non-Markovian channels
non-Markovian variable quantum
2010/11/8
We address continuous variable quantum key distribution (QKD) in non-Markovian lossy channels and show how the non-Markovian features may be exploited to enhance security and/or to detect the presence...
Would one rather store squeezing or entanglement in continuous variable quantum memories?
rather store squeezing entanglement continuous variable
2010/11/5
Given two quantum memories for continuous variables (e.g., the collective pseudo-spin of two atomic ensembles) and the possibility to perform passive optical operations (typically beam-splitters) on t...
How to decompose continuous-variable quantum logic gates
continuous-variable quantum logic gates
2010/10/29
We present a general and relatively efficient method for decomposing an arbitrary exponential operator of bosonic mode operators into a set of universal logic gates. Our work is mainly oriented toward...
Early Stage Disentanglement in Bipartite Continuous-Variable Systems
Early Stage Disentanglement Bipartite Continuous-Variable Systems
2010/10/20
Entanglement may vanish even for a limited amount of loss imposed on the quantum state, a
phenomenon known as entanglement sudden death in discrete systems, or, as proposed, early stage
disentanglem...
Analysis of a continuous-variable quadripartite cluster state from a single optical parametric oscillator
continuous-variable quadripartite cluster state single optical parametric oscillator
2010/10/20
We examine the feasibility of generating continuous-variable multipartite entanglement in an
intra-cavity quadruply concurrent downconversion scheme that has been proposed for the generation of clust...
Optimization of the transmission of observable expectation values and observable statistics in Continuous Variable Teleportation
transmission of observable expectation values observable statistics Continuous Variable Teleportation
2010/10/21
We analyze the statistics of observables in continuous variable (CV)quantum teleportation in the formalism of the characteristic function.We derive expressions for average values of output state obser...
Distillation of mixed-state continuous-variable entanglement by photon subtraction
Distillation mixed-state continuous-variable entanglement photon subtraction
2010/10/21
We present a detailed theoretical analysis for the distillation of one copy of a mixed two-mode
continuous-variable entangled state using beamsplitters and coherent photon-detection techniques,includ...
Continuous variable entanglement distillation of Non-Gaussian Mixed States
Continuous variable Non-Gaussian Mixed States
2010/3/10
Many different quantum information communication protocols such as teleportation, dense coding and entanglement based quantum key distribution are based on the faithful transmission of entanglement be...
Entanglement evolution of continuous variable quantum states
Entanglement evolution continuous variable quantum states
2010/3/10
We show when one of the modes of a initially bipartite Gaussian pure state interacts with a Gaussian noisy channel $\uppercase\expandafter{\romannumeral1}\otimes \$$, the evolution of entanglement can...
Continuous Variable Entanglement and Squeezing of Orbital Angular Momentum States
Continuous Variable Entanglement and Squeezing Orbital Angular Momentum States
2010/4/8
We report the first experimental characterization of the first-order continuous variable orbital angular momentum states. Using a spatially non-degenerate optical parametric oscillator (OPO) we produc...
Quantum Encryption Protocol Based on Continuous Variable EPR Correlations
quantum cryptography quantum encryption EPR correlations NOPA
2007/8/15
2006Vol.46No.1pp.61-64DOI:
Quantum Encryption Protocol Based on Continuous Variable EPR Correlations
HE Guang-Qiang and ZENG Gui-Hua
The State Key Laboratory of Fibre-Op...