Direct counterfactual quantum-communication protocol beyond a single-photon source

Li, Zheng Hong; Feng, Shang-Yue; Al‐Amri, M.; Zubairy, M. Suhail

doi:10.1103/physreva.106.032610

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…It corresponds to e γ≈0:11 and has been marked in the figure), our scheme can still provide large F. To better explain the result, we consider the extreme case when e γ ¼ 1, which means all photons reaching SSC 1 in a single cycle are lost when the atom is in |↑〉. Under such conditions, the interference between Zone 0 and Zone 1 is continuously interrupted, resulting in the output light field state in Zone 0 becomes |αcos 2 (π/2M)cos M−1 2(π/2M)〉 ≈ |α(1 − π 2 /2M)〉 48,49 , where the approximation is valid when M is sufficiently large. It is evident that when M ≫ |α|, the output photon state approaches |α〉, signifying that the total light loss induced by the atom-cavity coupling system over the entire preparation process (M cycles) is actually significantly suppressed.…”

Section: Resultsmentioning

confidence: 99%

“…After the entanglement, the optical CS is obtained by performing projection measurement on the quantum microsystem. In response to the situation that a quantum microsystem is typically very fragile when facing strong light fields, our solution is to utilize interaction-free measurement based on quantum Zeno effect [47][48][49] , which is considered a powerful non-invasive measurement method that can protect vulnerable samples. In this work, we further apply it to protect the quantum properties of the microscopic system from destruction by strong fields.…”

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confidence: 99%

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Method to deterministically generate large-amplitude optical cat states

Li,

Yu,

et al. 2024

Commun Phys

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Cat states, as an important resource in the study of macroscopic quantum superposition and quantum information applications, have garnered widespread attention. To date, preparing large-sized optical cat states has remained challenging. We demonstrate that, by utilizing interaction-free measurement and the quantum Zeno effect, even a fragile quantum microscopic system can deterministically control and become entangled with strong light fields, thereby generating large-amplitude optical cat states. During the entire preparation process, our method ensures that the microscopic system functions within a weak field environment, so that its quantum property can be protected. Furthermore, we show that the preparation of cat states is possible even when the quantum microsystem suffers from significant photon loss, provided that optical losses from classical devices are kept low, which implies that the fidelity of the cat state can be enhanced by improvements to and the perfection of the classical optical system.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Method to deterministically generate large-amplitude optical cat states

Li,

Yu,

et al. 2024

Commun Phys

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“…The counterfactual theory has been gradually improved, and in addition to quantum key distribution, other counterfactual quantum protocols [3,[7][8][9][10]have been successively proposed. In 2019, Aharonov and Vaidman [11] pointed out the existence of a faint trace of particles in the transmission channel, which sparked some controversy regarding the counterfactual claims.…”

Section: Introductionmentioning

confidence: 99%

Quantum privacy query protocol based on counterfactual quantum key distribution with noiseless attack

Liu,

Li,

Chen

et al. 2024

Preprint

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To save quantum resources and improve efficiency, this article proposes an efficient counterfactual quantum privacy query protocol. Counterfactual quantum privacy query refers to the identification of secure detection and key screening based on the detector's response results without the actual transmission of quantum information between user Bob and database Alice. Alice completes key transmission through a counterfactual device, while Bob measures the photon's polarization with a probability of 1/2 to obtain the encoded classical information, followed by traditional post-processing and privacy query operations. Additionally, to withstand the noise impact during the communication process, a modified counterfactual QKD protocol proposed by Rao (2021) is utilized, where communication parties randomly select a quantum bit flip with a specified probability \textit{f}, and then complete the quantum privacy query.

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Multitime quantum communication: Interesting but not counterfactual

Griffiths

2023

Phys. Rev. A

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Direct counterfactual quantum-communication protocol beyond a single-photon source

Cited by 5 publications

References 35 publications

Method to deterministically generate large-amplitude optical cat states

Method to deterministically generate large-amplitude optical cat states

Quantum privacy query protocol based on counterfactual quantum key distribution with noiseless attack

Multitime quantum communication: Interesting but not counterfactual

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