Proposal for loophole-free Bell test using homodyne detection

García−Patrón, Raúl

doi:10.1063/1.1834431

Cited by 6 publications

(8 citation statements)

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“…Most attention is being drawn by those CV states obtained from Gaussian states via subtracting photons [72,73,74]: they perform better as resources for protocols like teleportation [75,76] and allow for loophole-free tests of non-locality [67,68,69,70].…”

Section: Photon Subtracted Statesmentioning

confidence: 99%

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Transport and entanglement generation in the Bose–Hubbard model

Romero‐Isart

Eckert

Rodó

et al. 2007

J. Phys. A: Math. Theor.

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to reach a common decision. Classically, there is a bound in the number of possible traitors that can be involved in the game if only classical secure channels are used. In the simplest case where three parties are involved, one of them being a traitor, no classical solution exists. Nevertheless, a quantum solution exist, i.e. letting a traitor being involved and using as a fundamental resource multipartite entanglement it is permitted to reach a common agreement. We demonstrate that detectable broadcast is also solvable within Continuous Variable using multipartite entangled Gaussian states and Gaussian operations (homodyne detection). Furthermore, we show under which premises concerning entanglement content of the state, noise, inefficient homodyne detectors, our protocol is efficient and applicable with present technology. Our results are reported in [2].In chapter 5, we move to the problem of quantification of correlations (quantum and/or classical) between two Continuous Variable modes. We propose to define correlations between the two modes as the maximal number of correlated bits extracted via local quadrature measurements on each mode. On Gaussian states, where entanglement is accessible via their covariance matrix our quantification majorizes entanglement, reducing to an entanglement monotone for pure states. For mixed Gaussian states we provide an operational receipt to quantify explicitly the classical correlations presents in the states. We then address non-Gaussian states with our operational quantification that is based on and up to second moments only in contrast to the exact detection of entanglement that generally involves measurements of high-order moments. For non-Gaussian states, such as photonic Bell states, photon subtracted states and mixtures of Gaussian states, the bit quadrature correlations are shown to be also a monotonic function of the negativity. This quantification yields a feasible, operational way to measure non-Gaussian entanglement in current experiments by means of direct homodyne detection, without needing a complete state tomography. Our analysis demonstrates the rather surprising feature that entanglement in the considered non-Guassian examples can thus be detected and experimentally quantified with the same complexity as if dealing with Gaussian states. Our results are reported in [3].In chapter 6, we focus to atomic ensembles described as CV systems. Entanglement between distant mesoscopic atomic ensembles can be induced by measuring an ancillary light system. We show how to generate, manipulate and detect mesoscopic entanglement between an arbitrary number of atomic samples through a quantum non-demolition matter-light interface. Measurement induced entanglement between two macroscopical atomic samples was reported experimentally in 2001. There, the interaction between a single laser pulse propagating through two spatially separated atomic samples combined with a final projective measurement on the light led to the creation of pure EPR entanglement between the two sample...

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Section: Photon Subtracted Statesmentioning

confidence: 99%

“…For all T < 1, the entanglement of |ψ (T,r) ps eventually saturates, and above a squeezing threshold r T 1, the original GS is more entangled than the resulting non-Gaussian one. Following [67,68,69,70], the explicit expression of the quadrature bit correlations (5.4) can be analytically obtained…”

Section: Photon Subtracted Statesmentioning

confidence: 99%

Transport and entanglement generation in the Bose–Hubbard model

Romero‐Isart

Eckert

Rodó

et al. 2007

J. Phys. A: Math. Theor.

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show abstract

“…In this section, we will discuss the antibunching effect of the nonlocal CPA-TMST state.The criterion for the existence of antibunching in two-mode radiation is given by [22] …”

Section: Antibunching Effect Of the Nonlocal Cpa-tmst Statementioning

confidence: 99%

Nonclassical properties of nonlocal coherent photon-added two-mode squeezed thermal states

Wang

Fang

2015

Optik - International Journal for Light and Electron Optics

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“…In particular, this may lead to the production of strongly nonclassical states of light by increasing the available parametric gain [21]. Such high energy pulses would also be suitable for fundamental quantum mechanics tests [22].…”

Section: Introductionmentioning

confidence: 99%