Squeezed-state quantum key distribution upon imperfect reconciliation

Usenko, Vladyslav C.; Filip, Radim

doi:10.1088/1367-2630/13/11/113007

Cited by 61 publications

(66 citation statements)

References 38 publications

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“…Moreover, CV entanglement is affected but never vanishes completely for any level of external loss [4]. On these bases, CV quantum optics has experienced an increasing interest for its application to quantum key distribution (QKD) [5], with many proposals based on both single-mode [6][7][8] and two-mode squeezed light [9,10]. Entanglement distillation and entanglement swapping schemes for long distance quantum communication have been demonstrated [5,11] and systematic studies have been performed on the robustness of non-classicality against the communication channel losses [12,13].…”

mentioning

confidence: 99%

A fully guided-wave squeezing experiment for fiber quantum networks

Kaiser¹,

Fedrici²,

Zavatta³

et al. 2016

Optica

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We demonstrate, for the first time, the realization of an entirely guided-wave squeezing experiment at a telecom wavelength. The state generation relies on waveguide non-linear optics technology while squeezing collection and transmission are implemented by using only telecom fibre components. We observe up to −1.83 ± 0.05 dB of squeezing emitted at 1542 nm in CW pumping regime. The compactness and stability of the experiment, compared to free-space configurations, represent a significant step towards achieving out-of-the-lab CV quantum communication, fully compatible with existing telecom fibre networks. We believe that this work stands as a promising approach for real applications as well as for "do-it-yourself" experiments. PACS numbers:Generation and manipulation of continuous variable (CV) non-classical states of light are the object of intense research due to their importance in both fundamental and applied physics [1,2]. Among others, a valuable feature of CV quantum resources is that they can be generated in a deterministic way at the output of non-linear optical media [3]. Moreover, CV entanglement is affected but never vanishes completely for any level of external loss [4]. On these bases, CV quantum optics has experienced an increasing interest for its application to quantum key distribution (QKD) [5], with many proposals based on both single-mode [6-8] and two-mode squeezed light [9,10]. Entanglement distillation and entanglement swapping schemes for long distance quantum communication have been demonstrated [5,11] and systematic studies have been performed on the robustness of non-classicality against the communication channel losses [12,13]. A further step towards real-world applications of CV quantum communication has been done by generating squeezed light in the telecom C-band of wavelengths, where low-loss optical fibres and high performance standard components are available [14][15][16]. In the perspective of implementing quantum networks that exploit optical fibres to connect distant atomic quantum memories, a quantum interface has recently been developed, converting squeezed light from telecom to visible wavelengths compatible with suitable atomic transitions [17]. In the same spirit, a light-matter interface, coupling light guided in a tapered nanofibre to cold atoms, has been demonstrated [18].In this framework, and in order to comply with further out-of-the-lab realizations of CV quantum optics, we demonstrate, for the first time, the feasibility of a full guided-wave approach for both the generation and measurement of squeezed light at a telecom wavelength. In our scheme, single-mode squeezing at 1542 nm is generated by spontaneous parametric down conversion (SPDC) in a periodically poled lithium niobate ridge-waveguide (PPLN/RW). At the output of the PPLN/RW, the non-classical beam is measured with a fibre homodyne detector. This configuration allows implementing an extremely easy setup, entirely based on commercially available components, and fully compatible with existing fibre network...

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confidence: 99%

A fully guided-wave squeezing experiment for fiber quantum networks

Kaiser¹,

Fedrici²,

Zavatta³

et al. 2016

Optica

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“…5, where contour lines are crossing the diagonal in the same points at both the left and right plots. The effect is similar to vanishing of information leakage from the lossy channel by state engineering [22] or to entanglement-induced transparency [57,58].…”

Section: -Modementioning

confidence: 73%

“…Advantageously, the noise on the trusted sides is tolerable, allowing CV QKD with the noisy homodyne detection [17] and even with the thermal states [18][19][20][21]. Recently, the entanglement-based CV QKD with homodyne detection overcoming limits of the coherent state CV QKD [22] has been experimentally verified [23]. The Gaussian entanglement used in this advanced protocol is semiclassical since it still admits a local hidden variable model based on positive Wigner functions [24].…”

Section: Introductionmentioning

confidence: 99%

Entanglement-based continuous-variable quantum key distribution with multimode states and detectors

2014

Self Cite

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Secure quantum key distribution with multimode Gaussian entangled states and multimode homodyne detectors is proposed. In general the multimode character of both the sources of entanglement and the homodyne detectors can cause a security break even for a perfect channel when trusted parties are unaware of the detection structure. Taking into account the multimode structure and potential leakage of information from a homodyne detector reduces the loss of security to some extent. We suggest the symmetrization of the multimode sources of entanglement as an efficient method allowing us to fully recover the security irrespectively to multimode structure of the homodyne detectors. Further, we demonstrate that by increasing the number of the fluctuating but similar source modes the multimode protocol stabilizes the security of the quantum key distribution. The result opens the pathway towards quantum key distribution with multimode sources and detectors.

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“…These states play a key role in quantum metrology towards improving the sensitivity of the interferometers [13], and are of crucial importance in the recent gravitational wave detection via high-power laser interferometers [14]. The squeezed states are also important in the continuous variable quantum key distribution protocols [15], and they impart [16] an enhancement in comparison to their coherent analogs. Moreover, they have recently been used as sensitive detectors for photon scattering recoil events at the single photon level [17].…”

Section: Introductionmentioning

confidence: 99%

Nonclassicality and decoherence of photon-added squeezed coherent Schrödinger kitten states in a Kerr medium

Chakrabarti

Yogesh

2018

Physica A: Statistical Mechanics and its Applications

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We study the nonclassicality of the evolution of a superposition of an arbitrary number of photon-added squeezed coherent Schrödinger cat states in a nonlinear Kerr medium. The nonlinearity of the medium gives rise to the periodicities of the quantities such as the Wehrl entropy SQ and the negativity δW of the W -distribution, and a series of local minima of these quantities arise at the rational submultiples of the said period. At these local minima the evolving state coincides with the transient Yurke-Stoler type of photonadded squeezed kitten states, which, for the choice of the phase space variables reflecting their macroscopic nature, show extremely short-lived behavior. Proceeding further we provide the closed form tomograms, which furnish the alternate description of these short-lived states. The increasing complexity in the kitten formations induces more number of interference terms that trigger more quantumness of the corresponding states. The nonclassical depth of the photon-added squeezed kitten states are observed to be of maximum possible value. Employing the Lindblad master equation approach we study the amplitude and the phase damping models for the initial state considered here. In the phase damping model the nonclassicality is not completely erased even in the long time limit when the dynamical quantities, such as the negativity δW and the tomogram, assume nontrivial asymptotic values.arXiv:1706.09639v1 [quant-ph]

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Squeezed-state quantum key distribution upon imperfect reconciliation

Cited by 61 publications

References 38 publications

A fully guided-wave squeezing experiment for fiber quantum networks

A fully guided-wave squeezing experiment for fiber quantum networks

Entanglement-based continuous-variable quantum key distribution with multimode states and detectors

Nonclassicality and decoherence of photon-added squeezed coherent Schrödinger kitten states in a Kerr medium

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