Observing the quantum Cheshire cat effect with noninvasive weak measurement

Kim, Yosep; Im, Dong-Gil; Kim, Yong‐Su; Han, Sang-Wook; Moon, Sung; Kim, Yoon-Ho; Cho, Young Wook

doi:10.1038/s41534-020-00350-6

Cited by 16 publications

(6 citation statements)

References 47 publications

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“…It is illustrative to compare the non-local phase with the quantum Cheshire cat effect [71][72][73][74]. In this paradigm, a physical property (the "grin", here the internal atomic dofs) associated to a quantum particle is spatially disconnected from the particle location and can be isolated from the carrier (the "cat", here the external atomic dof).…”

mentioning

confidence: 99%

Dynamical Casimir effects with atoms: From the emission of photon pairs to geometric phases

Impens¹,

Souza²,

Matos³

et al. 2022

EPL

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The coupling between a moving ground-state atom and the quantum electromagnetic field is at the origin of several intriguing phenomena ranging from the dynamical Casimir emission of photons to Sagnac-like geometric phase shifts in atom interferometers. Recent progress in this emerging field reveals unprecedented connections between non-trivial aspects of modern physics such as electrodynamic retardation, non-unitary evolution in open quantum systems, geometric phases, non-locality and inertia.

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mentioning

confidence: 99%

Dynamical Casimir effects with atoms: From the emission of photon pairs to geometric phases

Impens¹,

Souza²,

Matos³

et al. 2022

EPL

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“…In realistic situation, some known methods namely the entanglement purification [62][63][64] and concentration [65,66] are used to distil the high-quality entangled states from low-quality entangled states. Degradation of entanglement due to decoherence effect is an important issue and various approaches have been reported for tackling the decoherence effect in quantum information processing [67,68].…”

Section: Discussionmentioning

confidence: 99%

Quantum information splitting among N-quantum nodes within a quantum network by using Bell states

Verma

2024

Phys. Scr.

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In quantum information processing, it is essential to ensure the security of quantum information so that it cannot be stolen and interrupted by an eavesdropper. For ensuring the security of information, quantum information splitting (QIS) method is used in which quantum communication is made more secure by splitting the quantum information among the various quantum nodes within a quantum network in such a way that any one node can retrieve the quantum information completely with the collaboration of remaining quantum nodes. In this paper, by using Bell states as the quantum channel we present a simple and precise scheme for quantum information splitting of an arbitrary single-qubit quantum information state among N (N ≥ 2) recipient nodes which are separately entangled with the sender node only and not with one another. We also generalize our scheme to the splitting of multi-qubit quantum information state among the N recipient nodes by using 2-qubit Bell states as the quantum resource. In comparison to the previous existing QIS schemes which require multi-qubit entangled states as the quantum resource, our proposed QIS scheme is very simple and feasible.

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“…And, the enhancement of the weak value of the required observable is greater than that of the effective observable detectable in the noisy situation (compare Eqs. ( 34) and (35) with Eq. ( 38)).…”

Section: A Disembodiment Of Noise From the Ideal System Using Quantum...mentioning

confidence: 99%

“…[8] and using photon interferometry in Refs. [9][10][11]35]. The concept has been further expanded upon in Refs.…”

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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Observing the quantum Cheshire cat effect with noninvasive weak measurement

Cited by 16 publications

References 47 publications

Dynamical Casimir effects with atoms: From the emission of photon pairs to geometric phases

Dynamical Casimir effects with atoms: From the emission of photon pairs to geometric phases

Quantum information splitting among N-quantum nodes within a quantum network by using Bell states

Isolating noise and amplifying signal with quantum Cheshire cat

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