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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Quantum entanglement
TL;DR: In this article, the basic aspects of entanglement including its characterization, detection, distillation, and quantification are discussed, and a basic role of entonglement in quantum communication within distant labs paradigm is discussed.
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Entanglement in continuous-variable systems: recent advances and current perspectives
TL;DR: The theory of continuous-variable entanglement with special emphasis on foundational aspects, conceptual structures and mathematical methods has been studied in this paper, where the most important results on the separability and distillability of Gaussian states are discussed.
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Extremal entanglement and mixedness in continuous variable systems
TL;DR: The concept of average logarithmic negativity is introduced, showing that it allows a reliable quantitative estimate of continuo us variable entanglement by direct measurements of global and marginal generalized p-entropies.
Journal ArticleDOI
Computable measure of nonclassicality for light.
TL;DR: The entanglement potential detects nonclassicality, has a direct physical interpretation, and can be computed efficiently, which make it stand out from previously proposed non classicality measures.
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Gaussian measures of entanglement versus negativities: Ordering of two-mode Gaussian states
TL;DR: Gaussian measures and negativities are definitely inequivalent measures of entanglement on nonsymmetric two-mode Gaussian states, even when restricted to a class of extremal states, and some strong evidence is provided suggesting that they are as well bounded from above as they are shown to be.
References
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Driving non-Gaussian to Gaussian states with linear optics
TL;DR: A protocol that maps finite-dimensional pure input states onto approximately Gaussian states in an iterative procedure that can be used to distill highly entangled bipartite GaussianStates from a supply of weakly entangled pure Gaussian States is introduced.
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Gaussian entanglement of formation
Michael M. Wolf,Michael M. Wolf,Geza Giedke,Geza Giedke,O. Krüger,Reinhard F. Werner,J. I. Cirac +6 more
TL;DR: A Gaussian version of the entanglement of formation adapted to bipartiteGaussian states by considering decompositions into pure Gaussian states only is introduced and it is shown that this quantity is anEntanglement monotone under Gaussian operations and provides a simplified computation for states of arbitrary many modes.
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Purity of Gaussian states: Measurement schemes and time evolution in noisy channels
TL;DR: In this paper, the authors studied the purity of Gaussian states of single-mode continuous variable systems and showed that the joint measurement of two conjugate quadratures is sufficient and sufficient to determine the purity at any time.
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Determination of continuous variable entanglement by purity measurements.
TL;DR: This work derives exact bounds that determine maximally and minimally entangled states for fixed global and marginal purities for Gaussian states according to their degree of total and partial mixedness.