Robust nonlocality tests with displacement-based measurements

Abstract

Lately, much interest has been directed towards designing setups that achieve decisive tests of local realism. Here we present Bell tests with measurements based on linear optical displacements and single-photon detection. The scheme displays good tolerance to loss. In particular, for entangled squeezed states, we find thresholds compatible with current efficiencies of detectors and sources. Furthermore, the scheme is easily extendible to any number of observers, allowing observation of multipartite nonlocality for a single photon shared among multiple modes. We also consider the case of atom-photon entanglement, where the loss threshold can be lowered further, as well as local filters compensating transmission and coupling inefficiencies at the source.

5 pages, 2 figures, significant content changes from v1, titled updated

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• Bell nonlocality
• Polynomial Bell inequalities
• Entanglement in indistinguishable particle systems
• Demonstration of EPR steering using single-photon path entanglement and displacement-based detection
• Setting up experimental Bell test with reinforcement learning
• Witnessing Opto-Mechanical Entanglement with Photon-Counting
• Testing nonlocality of a single photon without a shared reference frame
• Decoherence Effects on the Non-locality of Symmetric States
• Proposal for a Bell test in cavity optomagnonics
• Violation of Bell's Inequality in Electromechanics
• Nonlocality of $W$ and Dicke states subject to losses
• Realistic loophole-free Bell test with atom-photon entanglement
• Closing the detection loophole in multipartite Bell tests using GHZ states
• Closing the detection loophole in tripartite Bell tests using the W state
• Single-photon quantum nonlocality: Violation of the Clauser-Horne-Shimony-Holt inequality using feasible measurement setups
• Bounding the persistency of the nonlocality of W states
• Long Distance Nonlocality Test with Entanglement Swapping and Displacement-Based Measurements
• Detection Efficiency Bounds in (Semi-)Device-Independent Scenarios
• Constructing local models for general measurements on bosonic Gaussian states
• Semi-device-independent randomness certification on discretized continuous-variable platforms
• A Tractable Protocol for Detection-Loophole-Free Bell Tests over Long Distances