Can two quantum Cheshire cats exchange grins?

Das, Debmalya; Pati, Arun Kumar

doi:10.1088/1367-2630/ab8e5a

Cited by 23 publications

(10 citation statements)

References 39 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%

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%

Observing the quantum Cheshire cat effect with noninvasive weak measurement

Kim

et al. 2021

npj Quantum Inf

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“…The weak interaction between the system and the meter can be effected by a joint unitary Ûσ R z that couples the z component of the photon polarization to the meter. A convenient unitary operator that can serve this purpose, also used in [40,41], is given by…”

Section: Amplification Of Polarization Of a Photon Without The Photonmentioning

confidence: 99%

“…[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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“…In the context of quantum Cheshire cat, the possibility of isolating an object from its physical properties 7 has sparked the interest of theoretical physicists. Soon after, extensions and further discussions of more general scenarios were presented [8][9][10][11][12] . Also, the effect of quantum Cheshire cat has been found to have intrinsic links to other quantum paradoxes: for instance, the three-box paradox 13 .…”

mentioning

confidence: 99%

“…In this article, we report an experiment with manifoldly entangled photons that demonstrates a stronger object-property separation, whereby an object can permanently drop a certain property and acquire a property that it did not have from another object 11 . The photons are taken as "Cheshire cats", and their polarisations as "grins".…”

mentioning

confidence: 99%

Experimental exchange of grins between quantum Cheshire cats

Liu

Pan

et al. 2020

Nat Commun

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Intuition suggests that an object should carry all of its physical properties. However, a quantum object may not act in such a manner-it can temporarily leave some of its physical properties where it never appears. This phenomenon is known as the quantum Cheshire cat effect. It has been proposed that a quantum object can even permanently discard a physical property and obtain a new one it did not initially have. Here, we observe this effect experimentally by casting non-unitary imaginary-time evolution on a photonic cluster state to extract weak values, which reveals the counterintuitive phenomenon that two photons exchange their spins without classically meeting each other. A phenomenon presenting only in the quantum realm, our results are in stark contrast with the perception of inseparability between objects and properties, and shed new light on comprehension of the ontology of observables.

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Can two quantum Cheshire cats exchange grins?

Cited by 23 publications

References 39 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

Experimental exchange of grins between quantum Cheshire cats

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