Quantum state comparison amplifier with feedforward state correction

Mazzarella, Luca; Donaldson, Ross J.; Collins, Robert J.; Zanforlin, Ugo; Tatsi, G.; Buller, Gerald S.; Jeffers, John

doi:10.1117/12.2307818

Cited by 3 publications

(3 citation statements)

References 15 publications

(3 reference statements)

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“…x ∈ B |N| Variables x n ij encode whether an interval [i, j) ∈ I n is selected for the given station n ∈ N , hence they are binary. Constraint (11) ensures every time in the planning horizon at most one interval is active. Constraint (12) asserts that the required switching period before starting the next data transfer is respected.…”

Section: B1 Schedule Instancementioning

confidence: 99%

Scheduling of space to ground quantum key distribution

Polnik

Mazzarella

Carlo

et al. 2020

EPJ Quantum Technol.

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Satellite-based platforms are currently the only feasible way of achieving intercontinental range for quantum communication, enabling thus the future global quantum internet. Recent demonstrations by the Chinese spacecraft Micius have spurred an international space race and enormous interest in the development of both scientific and commercial systems. Research efforts so far have concentrated upon in-orbit demonstrations involving a single satellite and one or two ground stations. Ultimately satellite quantum key distribution should enable secure network communication between multiple nodes, which requires efficient scheduling of communication with the set of ground stations. Here we present a study of how satellite quantum key distribution can service many ground stations taking into account realistic constraints such as geography, operational hours, and most importantly, weather conditions. The objective is to maximise the number of keys a set of ground stations located in the United Kingdom could share while simultaneously reflecting the communication needs of each node and its relevance in the network. The problem is formulated as a mixed-integer linear optimisation program and solved to a desired optimality gap using a state of the art solver. The approach is presented using a simulation run throughout six years to investigate the total number of keys that can be sent to ground stations.

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Section: B1 Schedule Instancementioning

confidence: 99%

Scheduling of space to ground quantum key distribution

Polnik

Mazzarella

Carlo

et al. 2020

EPJ Quantum Technol.

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“…Losses as well as spurious counts are detrimental for the final secret key rate as it makes the quantum state less distinguishable [11,60]. In this section, we are going to model the channel between the satellite and the OGS and to review the source of losses and background counts.…”

Section: Channel Analysismentioning

confidence: 99%

QUARC: Quantum Research Cubesat—A Constellation for Quantum Communication

et al. 2020

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Quantum key distribution (QKD) offers future proof security based on fundamental laws of physics. Long-distance QKD spanning regions such as the United Kingdom (UK) may employ a constellation of satellites. Small satellites, CubeSats in particular, in low Earth orbit are a relatively low-cost alternative to traditional, large platforms. They allow the deployment of a large number of spacecrafts, ensuring greater coverage and mitigating some of the risk associated with availability due to cloud cover. We present our mission analysis showing how a constellation comprising 15 low-cost 6U CubeSats can be used to form a secure communication backbone for ground-based and metropolitan networks across the UK. We have estimated the monthly key rates at 43 sites across the UK, incorporating local meteorological data, atmospheric channel modelling and orbital parameters. We have optimized the constellation topology for rapid revisit and thus low-latency key distribution.

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“…In this paper, we present an experimental implementation of a measurement and feedforward mechanism applied to the SCAMP. A preliminary theoretical study has previously been presented in [36], which motivated this paper. To demonstrate…”

Section: Introductionmentioning

confidence: 99%

Quantum state correction using a measurement-based feedforward mechanism

et al. 2019

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One of the weaknesses of quantum optical state postselection schemes is the low success probability. Typically there is a trade-off between amplifier properties such as success probability and output state fidelity. However, here we present a state comparison amplifier for optical coherent states, which features an active measurement and feedforward mechanism to correct for errors made during the initial amplification. The simple and relatively low latency mechanism allows us to correct for a binary phase alphabet. We demonstrate a significant simultaneous improvement in the amplifier characteristic parameters: output state fidelity, correct state fraction, and success probability. This demonstrates that nondeterministic quantum amplification can be enhanced significantly by measurement and feedforward.

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Quantum state comparison amplifier with feedforward state correction

Cited by 3 publications

References 15 publications

Scheduling of space to ground quantum key distribution

Scheduling of space to ground quantum key distribution

QUARC: Quantum Research Cubesat—A Constellation for Quantum Communication

Quantum state correction using a measurement-based feedforward mechanism

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