Continuous variable quantum key distribution with modulated entangled states

Madsen, Lars S.; Usenko, Vladyslav C.; Lassen, Mikael; Filip, Radim; Andersen, Ulrik L.

doi:10.1038/ncomms2097

Cited by 188 publications

(143 citation statements)

References 32 publications

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“…The most typical communication tasks are quantum key distribution (QKD) [7][8][9][10][11][12][13][14][15][16][17], reliable transmission of quantum information [18,19] and distribution of entanglement [20][21][22]. The latter allows two remote parties to implement powerful protocols such as quantum teleportation [23][24][25], which is a crucial tool for the contruction of a future quantum Internet [26,27].…”

Section: Introductionmentioning

confidence: 99%

General bounds for sender-receiver capacities in multipoint quantum communications

Laurenza

Pirandola

2017

Phys. Rev. A

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We investigate the maximum rates for transmitting quantum information, distilling entanglement and distributing secret keys between a sender and a receiver in a multipoint communication scenario, with the assistance of unlimited two-way classical communication involving all parties. First we consider the case where a sender communicates with an arbitrary number of receivers, so called quantum broadcast channel. Here we also provide a simple analysis in the bosonic setting where we consider quantum broadcasting through a sequence of beamsplitters. Then, we consider the opposite case where an arbitrary number of senders communicate with a single receiver, so called quantum multiple-access channel. Finally, we study the general case of all-in-all quantum communication where an arbitrary number of senders communicate with an arbitrary number of receivers. Since our bounds are formulated for quantum systems of arbitrary dimension, they can be applied to many different physical scenarios involving multipoint quantum communication.

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Section: Introductionmentioning

confidence: 99%

General bounds for sender-receiver capacities in multipoint quantum communications

Laurenza

Pirandola

2017

Phys. Rev. A

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“…The QKD systems of today, both proof-of-principle laboratory implementations and commercial systems, require expensive low-noise lasers and detectors. Especially QKD systems using continuous variables (CV) suffer from excess noise which rapidly decreases the secure key rate [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Continuous Variable Quantum Key Distribution with a Noisy Laser

Jacobsen

Gehring

Andersen

2015

Entropy

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Existing experimental implementations of continuous-variable quantum key distribution require shot-noise limited operation, achieved with shot-noise limited lasers. However, loosening this requirement on the laser source would allow for cheaper, potentially integrated systems. Here, we implement a theoretically proposed prepare-and-measure continuous-variable protocol and experimentally demonstrate the robustness of it against preparation noise stemming for instance from technical laser noise. Provided that direct reconciliation techniques are used in the post-processing we show that for small distances large amounts of preparation noise can be tolerated in contrast to reverse reconciliation where the key rate quickly drops to zero. Our experiment thereby demonstrates that quantum key distribution with non-shot-noise limited laser diodes might be feasible.

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“…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

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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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Continuous variable quantum key distribution with modulated entangled states

Cited by 188 publications

References 32 publications

General bounds for sender-receiver capacities in multipoint quantum communications

General bounds for sender-receiver capacities in multipoint quantum communications

Continuous Variable Quantum Key Distribution with a Noisy Laser

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

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