What Is Nonlocal in Counterfactual Quantum Communication?

Aharonov, Yakir; Rohrlich, Daniel

doi:10.1103/physrevlett.125.260401

Cited by 16 publications

(13 citation statements)

References 7 publications

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“…In summary, we have shown both theoretically and experimentally that, given post-selection, sending a message without exchanging any physical particles is allowed by the laws of physics. What carries this information, however, remains a hot topic of research 19,29,30 . 11 , of which we show one cycle, cannot be said to be counterfactual from a consistent histories viewpoint.…”

Section: Figmentioning

confidence: 99%

The laws of physics do not prohibit counterfactual communication

et al. 2022

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It has been conjectured that counterfactual communication is impossible, even for post-selected quantum particles. We strongly challenge this by proposing precisely such a counterfactual scheme where—unambiguously—none of Alice’s photons that correctly contribute to her information about Bob’s message have been to Bob. We demonstrate counterfactuality experimentally by means of weak measurements, and conceptually using consistent histories—thus simultaneously satisfying both criteria without loopholes. Importantly, the fidelity of Alice learning Bob’s bit can be made arbitrarily close to unity.

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Section: Figmentioning

confidence: 99%

The laws of physics do not prohibit counterfactual communication

et al. 2022

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“…Conserved quantities in a quantum system are eigenstates of the system as a whole, which in this case is spatially entangled-hinting that in exchange-free operations spatial entanglement is the deeper explanation at work. Whereas one would have expected the super-information medium to obey conservation relations, the result in [53] provides important confirmation.…”

Section: Discussionmentioning

confidence: 96%

“…A recent result [53] has beautifully illustrated the local conservation of modular angular momentum of exchange-free communication. It has showed, using a simplified setup, that a local change of modular angular momentum in the form of a π phase-rotation of Bob's qubit is mirrored by a corresponding local change of modular angular momentum of Alice's photon, of exactly ℏ.…”

Section: Discussionmentioning

confidence: 97%

From counterportation to local wormholes

Salih

2023

Quantum Sci. Technol.

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We propose an experimental realisation of the protocol for the counterfactual disembodied transport of an unknown qubit---or what we call counterportation---where sender and receiver, remarkably, exchange no particles. We employ cavity quantum electrodynamics, estimating resources for beating the classical fidelity limit---except, unlike teleportation, no pre-shared entanglement nor classical communication are required. Our approach is multiple orders of magnitude more efficient in terms of physical resources than previously proposed implementation, paving the way for a demonstration using existing imperfect devices. Surprisingly, while such communication is intuitively explained in terms of ``interaction-free'' measurement and the Zeno effect, we show that neither is necessary, with far-reaching implications in support of an underlying physical reality. We go on to characterise an explanatory framework for counterportation starting from constructor theory: local wormholes. Conversely, a counterportation experiment demonstrating the traversability of space, by means of what is essentially a 2-qubit exchange-free quantum computer, can point to the existence in the lab of such traversable wormholes.

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“…It has since then inspired the pursuit of information flows between two parties without particles commuting in between. Latest proposals such as in [3], [4] had the basic construct of collapsing the wavefunctions at certain specific spacetimes as previously agreed by the sender and the receiver for the communication. This paper proposes the use of a perfect mirror [5] that reflects any incident photon back to the sender but transmits a portion of its wave to the receiver.…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Outline for Quantum Counterfactual Communication Via Perfect Mirror

Light

2022

EJPHYSICS

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Quantum counterfactual communication applies to information transmission that is free from particles commuting in-between; it is at the forefront of the present computing technology. Here, we consider a perfect mirror that reflects any incident photon with 100% probability. By the existing literature, the reflected photon loses a certain amount of energy because a portion of its wave nevertheless gets transmitted. That is, there exist separated photon-less waves that carry energies. We thus consider sending a photon to a perfect mirror and transmitting its wave to a receiver, which by gaining energy obtains the sought information.

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What Is Nonlocal in Counterfactual Quantum Communication?

Cited by 16 publications

References 7 publications

The laws of physics do not prohibit counterfactual communication

The laws of physics do not prohibit counterfactual communication

From counterportation to local wormholes

A Preliminary Outline for Quantum Counterfactual Communication Via Perfect Mirror

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