Experimental Detection of Quantum Coherent Evolution through the Violation of Leggett-Garg-Type Inequalities

Zhou, Zong‐Quan; Huelga, Susana F.; Li, Chuan‐Feng; Guo, Guang-Can

doi:10.1103/physrevlett.115.113002

Cited by 74 publications

(87 citation statements)

References 49 publications

(75 reference statements)

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“…An experimental violation of the two inequalities (10) and (11) has been described in Refs. [38,39,45]. (10)- (11), as a function of the time τ for a damped two-level system for two values of the damping coefficient γ.…”

Section: Leggett-garg Inequalitymentioning

confidence: 99%

Assessing the quantumness of a damped two-level system

Friedenberger

Lutz

2017

Phys. Rev. A

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We perform a detailed analysis of the nonclassical properties of a damped two-level system. We compute and compare three different criteria of quantumness, the l1-norm of coherence, the LeggettGarg inequality and a quantum witness based on the no-signaling in time condition. We show that all three quantum indicators decay exponentially in time as a result of the coupling to the thermal reservoir. We further demonstrate that the corresponding characteristic times are identical and given by the coherence half-life. These results quantify how violations of Leggett-Garg inequalities and nonzero values of the quantum witness are connected to the coherence of the two-level system.

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Section: Leggett-garg Inequalitymentioning

confidence: 99%

Assessing the quantumness of a damped two-level system

Friedenberger

Lutz

2017

Phys. Rev. A

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“…It has recently been applied to a number of systems [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Unfortunately, a clumsiness loophole [23] can thoroughly undermine the significance of any violation of the Leggett-Garg inequality.…”

Section: Introductionmentioning

confidence: 99%

Violation of noninvasive macrorealism by a superconducting qubit: Implementation of a Leggett-Garg test that addresses the clumsiness loophole

Huffman

Mizel

2017

Phys. Rev. A

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The Leggett-Garg inequality holds for any macrorealistic system that is being measured noninvasively. A violation of the inequality can signal that a system does not conform to our primal intuition about the physical world. Alternatively, a violation can simply indicate that "clumsy" experimental technique led to invasive measurements. Here, we consider a recent Leggett-Garg test designed to try to rule out the mundane second possibility. We tailor this Leggett-Garg test to the IBM 5Q Quantum Experience system and find compelling evidence that qubit Q2 of the system cannot be described by noninvasive macrorealism.

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“…It could be worth to test the quantum mechanics in such a weak interaction context. Although tests of incompatible of LGI and QM have been achieved in photonics and electronic experiments [29,30], nuclear spin qubits [31] and even condensed states [32], there are few reports of LGI violation in particle physics. Even though the MINOS and Daya Bay experimental setup show the LGtI violations, these two experiments are all in the context of two-flavor neutrino oscillation, which can not reveal the CP violation.…”

Section: Discussionmentioning

confidence: 99%

Testing violation of the Leggett–Garg-type inequality in neutrino oscillations of the Daya Bay experiment

Chen

2017

Eur. Phys. J. C

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The Leggett-Garg inequality (LGI), derived under the assumption of realism, acts as the temporal Bell inequality. It is studied in electromagnetic and strong interaction like photonics, superconducting qubits and nuclear spin. The weak interaction two-state oscillations of neutrinos affirmed the violation of Leggett-Garg-type inequalities (LGtI). We make an empirical test for the deviation of experimental results with the classical limits by analyzing the survival probability data of reactor neutrinos at a distinct range of baseline dividing energies, as an analog to a single neutrino detected at different times. A study of the updated data of the Daya Bay experiment unambiguously depicts an obvious cluster of data over the classical bound of LGtI and shows a 6.1σ significance of the violation of them.

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Experimental Detection of Quantum Coherent Evolution through the Violation of Leggett-Garg-Type Inequalities

Cited by 74 publications

References 49 publications

Assessing the quantumness of a damped two-level system

Assessing the quantumness of a damped two-level system

Violation of noninvasive macrorealism by a superconducting qubit: Implementation of a Leggett-Garg test that addresses the clumsiness loophole

Testing violation of the Leggett–Garg-type inequality in neutrino oscillations of the Daya Bay experiment

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