Feasibility of loophole-free nonlocality tests with a single photon

Abstract

Recently much interest has been directed towards designing setups that achieve realistic loss thresholds for decisive tests of local realism, in particular in the optical regime. We analyse the feasibility of such Bell tests based on a W-state shared between multiple parties, which can be realised for example by a single photon shared between spatial modes. We develop a general error model to obtain thresholds on the efficiencies required to violate local realism, and also consider two concrete optical measurement schemes.

8 pages, 5 figures

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• Device-independent security of quantum cryptography against collective attacks
• Bell inequality violation with two remote atomic qubits
• Experimentally faking the violation of Bell's inequalities
• Detection loophole in asymmetric Bell experiments
• Necessary and sufficient detection efficiency for the Mermin inequalities
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