Phase and polarization autocompensating N-dimensional quantum cryptography in multicore optical fibers

Balado, Daniel; Liñares, Jesús; Prieto-Blanco, Xesús; Barral, David

doi:10.1364/josab.36.002793

Cited by 14 publications

(27 citation statements)

References 26 publications

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“…For sake of simplicity we assume that polarization-maintaining optical fibers are used [3]. In that case, FMFs have negligible modal coupling, however unpredictable relative phases still happen [2]. In general, each optical mode will undergo coupling to other modes and therefore the state reaching Bob system from the Alice system will be a unpredictable 1-qudit state which prevents us to implement any protocol for QKD.…”

Section: Phase Conjugation Of Coherent Statesmentioning

confidence: 99%

“…Therefore, if we have a PC at A we obtain M = S q • • • S 1 , and after the light has traveled the path back and forth, the total coupling matrix is M M = I, that is, the unpredictable modal coupling has been removed. Therefore if we start from a state |L undergoing modal coupling, the state after the PC and travelling the path back is |L c given by equation (2). This is the key result to be used in a QKD system.…”

Section: Phase Conjugation Of Coherent Statesmentioning

confidence: 99%

“…When the 1-qudit again reaches the Bob system finds the D-M device, which cancels the delays τ between states |1 j . Finally, the circulator drives the state up to the device that implements projective measurements (PM) [2]. We show in figure 3 an integrated quantum projector (IQP) for the case of MCFs.…”

Section: Bb8autocompensating Systemmentioning

confidence: 99%

“…Mode instability is due to the modal coupling undergone by the modes in their propagation in optical fibers with small imperfections or slow temporal perturbations. To overcome this drawback some polarization autocompensating techniques have been proposed in cryptography with 1-qubit quantum states [1] or even with 1-qudits acquiring random relative phases [2]. In this work we propose a general autocompensating quantum cryptography technique based on phase conjugation for both few-mode optical fibers (FMF) and multicore optical fibers (MCF) where modal coupling is not negligible.…”

Section: Introductionmentioning

confidence: 99%

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Autocompensating high-dimensional quantum cryptography by phase conjugation in optical fibers

et al. 2020

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We present a system based on phase conjugation in optical fibers for autocompensating highdimensional quantum cryptohraphy. Phase changes and coupling effects are auto-compensated by a single loop between Alice and Bob. Bob uses a source of coherent states and next Alice attenuate them up to a single photon level and thus 1-qudit states are generated for implementing a particular QKD protocol, for instance the BB84 one, together with decoy states to detect eavesdropping attacks.

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Section: Phase Conjugation Of Coherent Statesmentioning

confidence: 99%

Section: Phase Conjugation Of Coherent Statesmentioning

confidence: 99%

Section: Bb8autocompensating Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Autocompensating high-dimensional quantum cryptography by phase conjugation in optical fibers

et al. 2020

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“…Likewise, imperfections in optical fiber can give rise to mode coupling. Solutions to such problems have been proposed in QKD protocols by the so-called autocompensating cryptography, thus, autocompensating QKD methods have been proposed for single photon states excited in polarization and/or spatial modes [13,14]. Autocompensating cryptography consists in taking the travelling light and make it go through some determinate optical elements that alter its state in such a way that the perturbations become harmless.…”

Section: Introductionmentioning

confidence: 99%

Autocompensating Measurement-Device-Independent Quantum Cryptography in Space Division Multiplexing Optical Fibers

Liñares

Carral

Prieto-Blanco

et al. 2021

Preprint

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Single photon or biphoton states propagating in optical bers or in free space are affected by random perturbations or imperfections along optical bers or free space that disturb the information encoded in such states and accordingly quantum key distribution is prevented. We propose three different systems for autocompensating such random perturbations and imperfections when a measurement-device-independent protocol is used. These systems correspond to different optical bers intended for space division multiplexing and supporting collinear modes, polarization modes or codirectional modes such as few-mode optical bers and multicore optical bers. Accordingly, we propose different Bell-states measurement devices. Finally, these types of optical bers allow the use of several transmission channels what compensates the reduction of the bit rate due to losses.

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Quantum Walks in Periodic and Quasiperiodic Fibonacci Fibers

Nguyen

Khrapko

et al. 2020

Sci Rep

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Quantum walk is a key operation in quantum computing, simulation, communication and information. Here, we report for the first time the demonstration of quantum walks and localized quantum walks in a new type of optical fibers having a ring of cores constructed with both periodic and quasiperiodic Fibonacci sequences, respectively. Good agreement between theoretical and experimental results have been achieved. The new multicore ring fibers provide a new platform for experiments of quantum effects in low-loss optical fibers which is critical for scalability of real applications with large-size problems. Furthermore, our new quasiperiodic Fibonacci multicore ring fibers provide a new class of quasiperiodic photonics lattices possessing both on-and offdiagonal deterministic disorders for realizing localized quantum walks deterministically. The proposed Fibonacci fibers are simple and straightforward to fabricate and have a rich set of properties that are of potential use for quantum applications. Our simulation and experimental results show that, in contrast with randomly disordered structures, localized quantum walks in new proposed quasiperiodic photonics lattices are highly controllable due to the deterministic disordered nature of quasiperiodic systems.

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Phase and polarization autocompensating N-dimensional quantum cryptography in multicore optical fibers

Cited by 14 publications

References 26 publications

Autocompensating high-dimensional quantum cryptography by phase conjugation in optical fibers

Autocompensating high-dimensional quantum cryptography by phase conjugation in optical fibers

Autocompensating Measurement-Device-Independent Quantum Cryptography in Space Division Multiplexing Optical Fibers

Quantum Walks in Periodic and Quasiperiodic Fibonacci Fibers

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