Matthew S. Winnel

University of Queensland

Quantum entanglementPhysicsStatistical physicsCommunications protocolTopologyCommunication channelKey distributionQuadrature (mathematics)Entanglement distillationGaussianUncertainty principleQuantum channelFocus (optics)Electronic engineeringFidelityHomodyne detectionState (functional analysis)Information leakageLinear amplificationProbability of successTruncationAsymmetryComputer scienceNoise (electronics)LaserQuantum information scienceModulationRepeaterLinear amplifierTransmission (telecommunications)QuantumQuantum key distribution

6Publications

2H-index

11Citations

Publications 6

Newest

#1Joshua J. GuanzonH-Index: 2

#2Matthew S. WinnelH-Index: 2

Last. Timothy C. RalphH-Index: 78

view all 4 authors...

We introduce a linear optical technique that can implement ideal quantum tele-amplification up to the n^\mathrm{th}Fock state, where ncan be any positive integer. Here tele-amplification consists of both quantum teleportation and noiseless linear amplification (NLA). This simple protocol consists of a beam-splitter and an (n+1)splitter, with nancillary photons and detection of nphotons. For a given target fidelity, our technique improves success probability and physical resource c...

#1Matthew S. WinnelH-Index: 2

#2Nedasadat HosseinidehajH-Index: 9

Last. Timothy C. RalphH-Index: 78

view all 3 authors...

A communication protocol based on a Gaussian modulation of squeezed states in a single quadrature and measured via homodyne detection can completely eliminate information leakage to an eavesdropper in a pure-loss channel. However, the asymmetry of the protocol with respect to the quadratures of light presents security issues and the eavesdropper's information is not necessarily minimized for general asymmetric attacks. Here, we perform asymptotic security analysis of the asymmetric protocol agai...

#1Nedasadat HosseinidehajH-Index: 9

#2Matthew S. WinnelH-Index: 2

Last. Timothy C. RalphH-Index: 78

view all 3 authors...

We consider a continuous-variable (CV) quantum key distribution (QKD) protocol over free-space channels, which is simpler and more robust than typical CV QKD protocols. It uses a bright laser, squeezed and modulated in the amplitude quadrature, and self-homodyne detection. We consider a scenario, where the line of sight is classically monitored to detect active eavesdroppers, so that we can assume a passive eavesdropper. Under this assumption, we analyse security of the QKD protocol in the compo...

Overcoming the repeaterless bound in continuous-variable quantum communication without quantum memories

#1Matthew S. WinnelH-Index: 2

#2Joshua J. GuanzonH-Index: 2

Last. Timothy C. RalphH-Index: 78

view all 4 authors...

One of the main problems in quantum communications is how to achieve high rates at long distances. Quantum repeaters, i.e., untrusted, intermediate relay stations, are necessary to overcome the repeaterless bound which sets the fundamental rate-distance limit of repeaterless communications. In this work, we introduce a continuous-variable protocol which overcomes the repeaterless bound and scales like the single-repeater bound using just one linear-optical device called a "quantum scissor", comb...

#1Matthew S. WinnelH-Index: 2

#2Nedasadat HosseinidehajH-Index: 9

Last. Timothy C. RalphH-Index: 78

view all 3 authors...

We generalise the concept of optical state truncation and noiseless linear amplification to enable truncation of the Fock-state expansion of an optical state to higher order and to simultaneously amplify it using linear optics. The resulting generalised quantum scissors are more efficient for noiseless linear amplification than employing multiple scissors in parallel and are experimentally practical. As a particular example, we focus on a third-order scissor device and demonstrate advantages in ...

#1Josephine Dias (NII: National Institute of Informatics)H-Index: 5

#2Matthew S. Winnel (UQ: University of Queensland)H-Index: 2

Last. Nedasadat Hosseinidehaj (UQ: University of Queensland)H-Index: 9

view all 4 authors...

Quantum repeaters have been proposed as a way of extending the reach of quantum communication. First generation approaches use entanglement swapping to connect entangled links along a long distance channel. Recently, there have been proposals for first generation quantum repeaters for continuous variables. In this paper, we present an improved continuous variable repeater scheme using fully deterministic optimal Gaussian entanglement swapping. Our scheme uses the noiseless linear amplifier for e...

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