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12.6 dB squeezed light at 1550 nm from a bow-tie cavity for long-term high duty cycle operation
Biveen Shajilal, Oliver Thearle, Aaron Tranter +5
Squeezed states are an interesting class of quantum states that have numerous applications. This work presents the design, characterisation, and operation of a bow-tie optical para…
Surpassing the repeaterless bound with a photon-number encoded measurement-device-independent quantum key distribution protocol
Ozlem Erkilic, Lorcan Conlon, Biveen Shajilal +5
Decoherence is detrimental to quantum key distribution (QKD) over large distances. One of the proposed solutions is to use quantum repeaters, which divide the total distance betwee…
Satellite-to-Ground Continuous Variable Quantum Key Distribution: The Gaussian and Discrete Modulated Protocols in Low Earth Orbit
Mikhael Sayat, Biveen Shajilal, Sebastian P. Kish +5
The Gaussian modulated continuous variable quantum key distribution (GM-CVQKD) protocol is known to maximise the mutual information between two parties during quantum key distribut…
The gap persistence theorem for quantum multiparameter estimation
Lorcán O. Conlon, Jun Suzuki, Ping Koy Lam +1
One key aspect of quantum metrology, measurement incompatibility, is evident only through the simultaneous estimation of multiple parameters. The symmetric logarithmic derivative C…
Comparison of Discrete Variable and Continuous Variable Quantum Key Distribution Protocols with Phase Noise in the Thermal-Loss Channel
Sebastian P. Kish, Patrick J. Gleeson, Angus Walsh +2
Discrete-variable (DV) quantum key distribution (QKD) based on single-photon detectors and sources have been successfully deployed for long-range secure key distribution. On the ot…
Observation of cross phase modulation in cold atom gradient echo memory
Anthony C. Leung, K. S. Ida Melody, Aaron D. Tranter +4
Strong nonlinear interactions between single photons have important applications in optical quantum information processing. Demonstrations of these interactions in cold atomic ense…