Experimental exchange of grins between quantum Cheshire cats

Liu, Zhenghao; Pan, Weiwei; Xu, Xiao‐Ye; Yang, Ming; Zhou, Jie; Luo, Ze-Yu; Sun, Kai; Chen, Jing-Ling; Xu, Jin‐Shi; Li, Chuan‐Feng; Guo, Guang‐Can

doi:10.1038/s41467-020-16761-0

Cited by 29 publications

(11 citation statements)

References 30 publications

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“…While the second-order quantum interference is employed in our experiment for the weak noninvasive system-pointer measurement interaction, the weak values in the experiment by Z.-H. Liu et al were only inferred from the linear relation between the post-selection probability and the perturbation strength. Instead, in their experiment, the secondorder quantum interference appeared for introducing two quantum Cheshire cats, demonstrating the exchange of grins between two cats 47,48 .…”

Section: Discussionmentioning

confidence: 99%

“…Note added. During our manuscript being reviewed, we became aware of a relevant work by Z.-H. Liu et al 47 , where the secondorder quantum interference was involved to reveal the quantum nature of the quantum Cheshire cat effect. While the second-order quantum interference is employed in our experiment for the weak noninvasive system-pointer measurement interaction, the weak values in the experiment by Z.-H. Liu et al were only inferred from the linear relation between the post-selection probability and the perturbation strength.…”

Section: Discussionmentioning

confidence: 99%

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Observing the quantum Cheshire cat effect with noninvasive weak measurement

Kim

et al. 2021

npj Quantum Inf

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One of the common conceptions of nature, typically derived from the experiences with classical systems, is that attributes of the matter coexist with the substance. In the quantum regime, however, the quantum particle itself and its physical property may be in spatial separation, known as the quantum Cheshire cat effect. While there have been several reports to date on the observation of the quantum Cheshire cat effect, all such experiments are based on first-order interferometry and destructive projection measurement, thus allowing simple interpretation due to measurement-induced disturbance and also subject to trivial interpretation based on classical waves. In this work, we report an experimental observation of the quantum Cheshire cat effect with noninvasive weak quantum measurement as originally proposed. The use of the weak-measurement probe has allowed us to identify the location of the single photon and that of the disembodied polarization state in a quantum interferometer. The weak-measurement probe based on two-photon interference makes our observation unable to be explained by classical physics. We furthermore elucidate the quantum Cheshire cat effect as quantum interference of the transition amplitudes for the photon and the polarization state which are directly obtained from the measurement outcomes or the weak values. Our work not only reveals the true quantum nature of Cheshire cat effect but also sheds light on a comprehensive understanding for the counter-intuitive quantum phenomena.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Observing the quantum Cheshire cat effect with noninvasive weak measurement

Kim

et al. 2021

npj Quantum Inf

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“…[36][37][38][39], and different kinds of manipulations of the photon polarization, independent of the photon, have been achieved in Refs. [40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Isolating noise and amplifying signal with quantum Cheshire cat

Soham¹,

Ghoshal²,

Das³

et al. 2022

Preprint

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The quantum Cheshire cat is a phenomenon in which an object, identified with a "cat", is dissociated from a property of the object, identified with the "grin" of the cat. We propose a thought experiment, similar to this phenomenon, with an interferometric setup, where a property (a component of polarization) of an object (photon) can be separated from the object itself and can simultaneously be amplified when it is already decoupled from its object. We further show that this setup can be used to dissociate two complementary properties, e.g. two orthogonal components of polarization of a photon and identified with the grin and the snarl of a cat, from each other and one of them can be amplified while being detached from the other. Moreover, we extend the work to a noisy scenario, effected by a spin-orbit coupling -like additional interaction term in the Hamiltonian for the measurement process, with the object in this scenario being identified with a "confused Cheshire cat". We devise a gedanken experiment in which such a "confusion" can be successfully dissociated from the system, and we find that the dissociation helps in amplification of signals.

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“…TSVF finds intriguing applications in quantum foundations [7][8][9][10][11][12][13] and quantum information processing [14]. The ABL retrodiction, more specifically the TSVF, has resulted in various counter intuitive results commonly called PPS paradoxes [15][16][17][18][19][20][21][22][23]. In a recent work [24] counterfactual use of ABL retrodiction has been shown to run into a direct contradiction with operational quantum mechanics challenging the completeness of TSVF.…”

Section: Introductionmentioning

confidence: 99%

No contextual advantage in non-paradoxical scenarios of two state vector formalism

Singh,

Bhati

2022

Preprint

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The two state vector formalism (TSVF) was proposed by Aharonov, Bergmann, and Lebowitz (ABL) to provide a way for the counterfactual assignment of the probabilities of outcomes of contemplated but unperformed measurements on quantum systems. This formalism underlies various aspects of foundations of quantum theory and has been used significantly in the development of weak values and several proofs of quantum contextuality. We consider the application of TSVF, with preand post-selection (PPS) and the corresponding ABL rule, as a means to unearth quantum contextuality. We use the principle of exclusivity to classify the resultant pre-and post-selection scenarios as either paradoxical or non-paradoxical. In light of this, we find that several previous proofs of the emergence of contextuality in PPS scenarios are only possible if the principle of exclusivity is violated and are therefore classified as paradoxical. We argue that these do not constitute a proper test of contextuality. Furthermore, we provide a numerical analysis for the KCBS scenario as applied in the paradigm of TSVF and find that non-paradoxical scenarios do not offer any contextual advantage. Our approach can be easily generalized for other contextual scenarios as well.

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Experimental exchange of grins between quantum Cheshire cats

Cited by 29 publications

References 30 publications

Observing the quantum Cheshire cat effect with noninvasive weak measurement

Observing the quantum Cheshire cat effect with noninvasive weak measurement

Isolating noise and amplifying signal with quantum Cheshire cat

No contextual advantage in non-paradoxical scenarios of two state vector formalism

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