Optimal Coherent Filtering for Single Noisy Photons

Gao, Shitao; Lazo-Arjona, Oscar; Brecht, Benjamin; Kaczmarek, Krzysztof T.; Thomas, S. E.; Nunn, Joshua; Ledingham, Patrick M.; Saunders, D. J.

doi:10.1103/physrevlett.123.213604

Cited by 18 publications

(12 citation statements)

References 47 publications

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“…time, spatial mode, etc.). Current photonic technology provides effective filtering systems for all these degrees of freedom [38][39][40][41], which allows the users to counter the described category of attacks at the price of a more complicated set-up and a reduction in the secret key rate.…”

Section: Theorem 2 (Frommentioning

confidence: 99%

Experimental Semi-quantum Key Distribution With Classical Users

Massa

Yadav

Moqanaki

et al. 2022

Quantum

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Quantum key distribution, which allows two distant parties to share an unconditionally secure cryptographic key, promises to play an important role in the future of communication. For this reason such technique has attracted many theoretical and experimental efforts, thus becoming one of the most prominent quantum technologies of the last decades. The security of the key relies on quantum mechanics and therefore requires the users to be capable of performing quantum operations, such as state preparation or measurements in multiple bases. A natural question is whether and to what extent these requirements can be relaxed and the quantum capabilities of the users reduced. Here we demonstrate a novel quantum key distribution scheme, where users are fully classical. In our protocol, the quantum operations are performed by an untrusted third party acting as a server, which gives the users access to a superimposed single photon, and the key exchange is achieved via interaction-free measurements on the shared state. We also provide a full security proof of the protocol by computing the secret key rate in the realistic scenario of finite-resources, as well as practical experimental conditions of imperfect photon source and detectors. Our approach deepens the understanding of the fundamental principles underlying quantum key distribution and, at the same time, opens up new interesting possibilities for quantum cryptography networks

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Section: Theorem 2 (Frommentioning

confidence: 99%

Experimental Semi-quantum Key Distribution With Classical Users

Massa

Yadav

Moqanaki

et al. 2022

Quantum

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show abstract

“…Akiba [6] Cold Rb atom EIT 14 0.25 7.7 Clausen [7] Nd:Y 2 SiO 5 AFC 21 0.025 30 Zhang [8] Cold Rb atom EIT 9.8 0.2 10 Rieländer [10] Pr:Y 2 SiO 5 AFC 11 1.5 11 Seri [35] P r :Y 2 SiO 5 AFC 12 1.5 61 Seri [36] P r :Y different physical systems in a quantum network [31]. By using a time-dependent coupling pulse during the retrieval process, it could be used to generate single photons with widely tunable waveform [32], as well as a quantum buffer to match the temporal mode of different single-photon sources [33].…”

Section: Groupmentioning

confidence: 99%

Quantum storage and manipulation of heralded single photons in atomic memories based on electromagnetically induced transparency

Tsai

Hsiao

Chen

2020

Phys. Rev. Research

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We demonstrate the storage and manipulation of heralded single photons generated from a cavity-enhanced spontaneous parametric down-conversion (SPDC) source in the atomic quantum memory based on electromagnetically induced transparency. We show that nonclassical correlations are preserved between the heralding and the retrieved photons after storage process. By varying the intensity of the coupling field during retrieval process, we further demonstrate that the waveform or bandwidth of the single photons can be manipulated and the reduction of the nonclassical correlation between the photon pairs can be compensated. Our SPDC photon pairs are generated in a single pair of longitudinal cavity modes, which not only reduces the experimental complexity arising from external filtering but also increases the useful photon generation rate. Our results can be scaled up with ease and thus lay the foundation for future realization of large-scale applications in quantum information processing.

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“…They are at the heart of each node and interconnect in visions of a quantum internet [1,2], and central to the standard paradigm of quantum repeaters [3][4][5]. They can be used to synchronize probabilistic gate operations and sources [6,7], and can even improve the indistinguishability of photons emitted by quantum dots through filtering [8]. Further prospective applications include linear optical quantum computing, metrology, and photon detection [9,10].…”

Section: Introductionmentioning

confidence: 99%

Single-Photon Storage in a Ground-State Vapor Cell Quantum Memory

Buser,

Mottola,

Cotting

et al. 2022

Preprint

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Optimal Coherent Filtering for Single Noisy Photons

Cited by 18 publications

References 47 publications

Experimental Semi-quantum Key Distribution With Classical Users

Experimental Semi-quantum Key Distribution With Classical Users

Quantum storage and manipulation of heralded single photons in atomic memories based on electromagnetically induced transparency

Single-Photon Storage in a Ground-State Vapor Cell Quantum Memory

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