Characterizing entanglement of an artificial atom and a cavity cat state with Bell’s inequality

Brian Vlastakis (), Andrei Petrenko, Nissim Ofek, Luyan Sun, Zaki Leghtas, Katrina Sliwa, Yehan Liu, Michael Hatridge, Jacob Blumoff, Luigi Frunzio, Mazyar Mirrahimi, Liang Jiang, M. H. Devoret and R. J. Schoelkopf ()
Additional contact information
Brian Vlastakis: Yale University
Andrei Petrenko: Yale University
Nissim Ofek: Yale University
Luyan Sun: Yale University
Zaki Leghtas: Yale University
Katrina Sliwa: Yale University
Yehan Liu: Yale University
Michael Hatridge: Yale University
Jacob Blumoff: Yale University
Luigi Frunzio: Yale University
Mazyar Mirrahimi: Yale University
Liang Jiang: Yale University
M. H. Devoret: Yale University
R. J. Schoelkopf: Yale University

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract The Schrodinger’s cat thought experiment highlights the counterintuitive concept of entanglement in macroscopically distinguishable systems. The hallmark of entanglement is the detection of strong correlations between systems, most starkly demonstrated by the violation of a Bell inequality. No violation of a Bell inequality has been observed for a system entangled with a superposition of coherent states, known as a cat state. Here we use the Clauser–Horne–Shimony–Holt formulation of a Bell test to characterize entanglement between an artificial atom and a cat state, or a Bell-cat. Using superconducting circuits with high-fidelity measurements and real-time feedback, we detect correlations that surpass the classical maximum of the Bell inequality. We investigate the influence of decoherence with states up to 16 photons in size and characterize the system by introducing joint Wigner tomography. Such techniques demonstrate that information stored in superpositions of coherent states can be extracted efficiently, a crucial requirement for quantum computing with resonators.

Date: 2015
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DOI: 10.1038/ncomms9970

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