Detecting nonlocal Cooper pair entanglement by optical Bell inequality violation

Abstract

Based on the Bardeen Cooper Schrieffer (BCS) theory of superconductivity, the coherent splitting of Cooper pairs from a superconductor to two spatially separated quantum dots has been predicted to generate nonlocal pairs of entangled electrons. In order to test this hypothesis, we propose a scheme to transfer the spin state of a split Cooper pair onto the polarization state of a pair of optical photons. We show that the produced photon pairs can be used to violate a Bell inequality, unambiguously demonstrating the entanglement of the split Cooper pairs.

11 pages, 9 figures, v3 with added references

References in corpus (5)

• Experimental quantum teleportation
• Prospects for Spin-Based Quantum Computing
• Entanglement transfer from electron spins to photons in spin light-emitting diodes containing quantum dots
• Probing individual split Cooper-pairs using the spin qubit toolkit
• Probing coherent Cooper pair splitting with cavity photons

Cited by in corpus (10)

• Nonlocal quantum heat engines made of hybrid superconducting devices
• Signatures of nonlocal Cooper-pair transport and of a singlet-triplet transition in the critical current of a double-quantum-dot Josephson junction
• Spin correlation and entanglement detection in Cooper pair splitters by current measurements using magnetic detectors
• Double quantum dot Cooper-pair splitter at finite couplings
• Josephson response of a conventional and a noncentrosymmetric superconductor coupled via a double quantum dot
• Luminescence and Squeezing of a Superconducting Light Emitting Diode
• Thermoelectric processes of quantum normal-superconductor interfaces
• Photonic cross-noise spectroscopy of Majorana bound states
• Probing Majorana bound states via a pn-junction containing a quantum dot
• Entangled Photon-Pair Emission in Waveguide Circuit QED from a Cooper Pair Splitter