期刊
PHYSICAL REVIEW A
卷 91, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.91.042314
关键词
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资金
- Office of Science of the US Department of Energy [DE-AC05-00OR22725]
- EPSRC [EP/K004506/1]
- ARO MURI [W911NF-11-1-0268]
- ARO [W911NF-12-1-0523]
- Lockheed Martin Corporation
- USC Provost's Ph.D. fellowship
- Engineering and Physical Sciences Research Council [EP/H005544/1, EP/K004506/1] Funding Source: researchfish
- EPSRC [EP/H005544/1, EP/K004506/1] Funding Source: UKRI
Recently the question of whether the D-Wave processors exhibit large-scale quantum behavior or can be described by a classical model has attracted significant interest. In this work we address this question by studying a 503-qubitD-Wave Two device in the black box model i.e., by studying its input-output behavior. Our work generalizes an approach introduced in Boixo et al. [Nat. Commun. 4, 2067 (2013)] and uses groups of up to 20 qubits to realize a transverse Ising model evolution with a ground-state degeneracy whose distribution acts as a sensitive probe that distinguishes classical and quantum models for the D-Wave device. Our findings rule out all classical models proposed to date for the device and provide evidence that an open-system quantum dynamical description of the device that starts from a quantized energy level structure is well justified, even in the presence of relevant thermal excitations and a small value of the ratio of the single-qubit decoherence time to the annealing time.
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