A strict experimental test of macroscopic realism in a superconducting flux qubit

George C. Knee (), Kosuke Kakuyanagi, Mao-Chuang Yeh, Yuichiro Matsuzaki, Hiraku Toida, Hiroshi Yamaguchi, Shiro Saito, Anthony J. Leggett and William J. Munro ()
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George C. Knee: NTT Basic Research Laboratories, NTT Corporation
Kosuke Kakuyanagi: NTT Basic Research Laboratories, NTT Corporation
Mao-Chuang Yeh: University of Illinois at Urbana-Champaign
Yuichiro Matsuzaki: NTT Basic Research Laboratories, NTT Corporation
Hiraku Toida: NTT Basic Research Laboratories, NTT Corporation
Hiroshi Yamaguchi: NTT Basic Research Laboratories, NTT Corporation
Shiro Saito: NTT Basic Research Laboratories, NTT Corporation
Anthony J. Leggett: University of Illinois at Urbana-Champaign
William J. Munro: NTT Basic Research Laboratories, NTT Corporation

Nature Communications, 2016, vol. 7, issue 1, 1-5

Abstract: Abstract Macroscopic realism is the name for a class of modifications to quantum theory that allow macroscopic objects to be described in a measurement-independent manner, while largely preserving a fully quantum mechanical description of the microscopic world. Objective collapse theories are examples which aim to solve the quantum measurement problem through modified dynamical laws. Whether such theories describe nature, however, is not known. Here we describe and implement an experimental protocol capable of constraining theories of this class, that is more noise tolerant and conceptually transparent than the original Leggett–Garg test. We implement the protocol in a superconducting flux qubit, and rule out (by ∼84 s.d.) those theories which would deny coherent superpositions of 170 nA currents over a ∼10 ns timescale. Further, we address the ‘clumsiness loophole’ by determining classical disturbance with control experiments. Our results constitute strong evidence for the superposition of states of nontrivial macroscopic distinctness.

Date: 2016
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DOI: 10.1038/ncomms13253

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