How to Measure Squeezing and Entanglement of Gaussian States without Homodyning
Jaromír Fiurášek,Nicolas J. Cerf +1 more
TLDR
This work proposes a scheme for measuring the squeezing, purity, and entanglement of Gaussian states of light that does not require homodyne detection and needs only beam splitters and single-photon detectors.Abstract:
We propose a scheme for measuring the squeezing, purity, and entanglement of Gaussian states of light that does not require homodyne detection. The suggested setup needs only beam splitters and single-photon detectors. Two-mode entanglement can be detected from coincidences between photodetectors placed on the two beams.read more
Citations
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Quantification of continuous variable entanglement with only two types of simple measurements
TL;DR: In this article, the authors propose an experimental set-up in which it is possible to obtain the entanglement of a two-mode Gaussian state, be it pure or mixed, using only simple linear optical measurement devices.
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Realization of superposition and entanglement of coherent and squeezed states in circuit quantum electrodynamics
ChangYong Chen,Qing Sun +1 more
TL;DR: In this paper, the authors proposed a new scheme for generating the superposition and entanglement of the coherent states and squeezed states by considering N superconducting charge qubits interacting with photons in a high finesse cavity on a chip, assisted by a strong driving field.
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Characteristic time and maximum mixedness: Single mode Gaussian states in dissipative channels
Leonardo A. M. Souza,M. C. Nemes +1 more
TL;DR: In this article, an upper bound for the mixedness of single bosonic mode Gaussian states propagating in dissipative channels is derived, which is a function of the initial squeezing and temperature of the channel only.
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Comparative Study of Quantum Features of Radiation Generated by Nondegenerate Down-Conversion
TL;DR: In this article, a comparative study of quantum properties associated with coherent correlations between the modes of light generated by a nondegenerate parametric down-conversion process is presented, and the degree of nonclassicality that can be quantified by logarithmic negativity and quantum discord is compared, and a striking similar tendency is observed.
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Optimal characterization of Gaussian channels using photon-number-resolving detectors
TL;DR: In this paper, an optimal scheme based on photon-number measurements for Gaussian state tomography and Gaussian process tomography is presented. But the scheme requires exactly $2{n}^{2}+3n$ distinct photon number measurements to tomograph the state and is therefore optimal.
References
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Journal ArticleDOI
Computable measure of entanglement
Guifre Vidal,Reinhard F. Werner +1 more
TL;DR: A measure of entanglement that can be computed effectively for any mixed state of an arbitrary bipartite system is presented and it is shown that it does not increase under local manipulations of the system.
Journal ArticleDOI
Quantum Information with Continuous Variables
TL;DR: In this article, the authors present the Deutsch-Jozsa algorithm for continuous variables, and a deterministic version of it is used for quantum information processing with continuous variables.
Journal ArticleDOI
Peres-horodecki separability criterion for continuous variable systems
TL;DR: The Peres-Horodecki criterion of positivity under partial transpose is studied in the context of separability of bipartite continuous variable states and turns out to be a necessary and sufficient condition for separability.
Journal ArticleDOI
Inseparability Criterion for Continuous Variable Systems
TL;DR: An inseparability criterion based on the total variance of a pair of Einstein-Podolsky-Rosen type operators is proposed for continuous variable systems and turns out to be a necessary and sufficient condition for inseparability.
Book
A Guide to Experiments in Quantum Optics
Hans-A. Bachor,Timothy C. Ralph +1 more
TL;DR: In this paper, the authors present a survey of classical models of light experiments with Photons, as well as non-demolition experiments with light and non-quantum noise.