Probabilistic simulation of mesoscopic “Schrödinger cat” states

We carry out probabilistic phase-space sampling of mesoscopic Schrödinger cat quantum states, demonstrating multipartite Bell violations for up to 60 qubits. We use states similar to those generated in photonic and ion-trap experiments. These results show that mesoscopic quantum superpositions are d...

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Bibliographic Details
Published in:Physics letters. A 2014-02, Vol.378 (13), p.946-949
Main Authors: Opanchuk, B., Rosales-Zárate, L., Reid, M.D., Drummond, P.D.
Format: Article
Language:English
Subjects:
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Computer simulation
Probabilistic methods
Probability theory
Qubits (quantum computing)
Sampling
Schroedinger cat state
Solid state physics
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Summary:We carry out probabilistic phase-space sampling of mesoscopic Schrödinger cat quantum states, demonstrating multipartite Bell violations for up to 60 qubits. We use states similar to those generated in photonic and ion-trap experiments. These results show that mesoscopic quantum superpositions are directly accessible to probabilistic sampling, and we analyze the properties of sampling errors. We also demonstrate dynamical simulation of super-decoherence in ion traps. Our computer simulations can be either exponentially faster or slower than experiment, depending on the correlations measured. •We simulate mesoscopic quantum paradoxes probabilistically.•Our results show Bell violations with up to 60 spins.•This is a counter-example to an argument of Feynman, who thought it was not possible.•The time taken varies strongly with the order of correlation computed.•Our results demonstrate an exponential speed-up compared to experiment.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2014.01.045