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We propose a realistic circuit QED experiment to test the extraction of past-future vacuum entanglement to a pair of superconducting qubits.
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Although in [ 9 ] these correlations are referred to as entanglement, such a wording might not be appropriate since quantum states in past and future belong to Hilbert spaces defined in different simultaneity planes. Nevertheless, quantum correlations of this sort can in principle be extracted to physical systems and exploited as a resource for quantum information tasks as in the case of typical entanglement
Cited in the paper.
Note that we will use the term “past-future” correlations to refer to a different and more general notion than “time-like entanglement” or “entanglement between the past and the future light cones”
Cited in the paper.
To have a mirror interpretation for a plane-wave-like basis like that provided in [ 9 ] we would need observers undergoing forbidden trajectories in the spacetime -horizontal hyperbolas in past and future light cones
Cited in the paper.
S. J. Olson and T. C. Ralph, Phys. Rev. A 85
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M. Baur, A. Fedorov, L. Steffen, S. Filipp, M. P. da Silva, and A. Wallraff, Phys. Rev. Lett. 108
2012
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