Article
Exponentially decreasing critical detection efficiency for any Bell inequality
Author/s | Miklin, Nikolai
Chaturvedi, Anubhav Bourennane, Mohamed Pawłowski, Marcin Cabello Quintero, Adán |
Department | Universidad de Sevilla. Departamento de Física Aplicada II |
Publication Date | 2022-11-30 |
Deposit Date | 2023-04-24 |
Published in |
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Abstract | We address the problem of closing the detection efficiency loophole in Bell experiments, which is crucial for real-world applications. Every Bell inequality has a critical detection efficiency η that must be surpassed to ... We address the problem of closing the detection efficiency loophole in Bell experiments, which is crucial for real-world applications. Every Bell inequality has a critical detection efficiency η that must be surpassed to avoid the detection loophole. Here, we propose a general method for reducing the critical detection efficiency of any Bell inequality to arbitrary low values. This is accomplished by entangling two particles in N orthogonal subspaces (e.g., N degrees of freedom) and conducting N Bell tests in parallel. Furthermore, the proposed method is based on the introduction of penalized N-product (PNP) Bell inequalities, for which the so-called simultaneous measurement loophole is closed, and the maximum value for local hiddenvariable theories is simply the Nth power of the one of the Bell inequality initially considered. We show that, for the PNP Bell inequalities, the critical detection efficiency decays exponentially with N. The strength of our method is illustrated with a detailed study of the PNP Bell inequalities resulting from the Clauser-Horne-Shimony-Holt inequality. |
Funding agencies | Ministerio de Economia, Industria y Competitividad (MINECO). España European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER) Deutsche Forschungsgemeinschaft / German Research Foundation (DFG) Foundation for Polish Science Swedish Research Council |
Project ID. | PCI2019-111885-2
441423094 |
Citation | Miklin, N., Chaturvedi, A., Bourennane, M., Pawłowski, M. y Cabello Quintero, A. (2022). Exponentially decreasing critical detection efficiency for any Bell inequality. Physical Review Letters, 129 (230403). https://doi.org/10.1103/PhysRevLett.129.230403. |
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