Keynote
Improving QKD for entangled states with low squeezing via non-Gaussian operations
Robert Malaney |
Prof. Robert Malaney
School of Electrical Engineering and Telecommunications
University of New South Wales (UNSW), Sydney
Australia
Abstract
Eduardo Villasenor and Robert Malaney
School of Electrical Engineering and Telecommunications, University
of New South Wales (UNSW), Sydney, Australia
In this work we focus on evaluating the effectiveness of two
non-Gaussian operations, photon subtraction (PS) and quantum
scissors (QS) in terms of Continuous Variable (CV)-Quantum Key
Distribution (QKD) over lossy channels. Each operation is analysed
in two scenarios, one with the operation applied transmitter-side
to a Two-Mode Squeezed Vacuum (TMSV) state and a second with the
operation applied to the TMSV state receiver-side. We numerically
evaluate the entanglement and calculate the QKD key rates produced
in all four possible scenarios. Our results show that for a fixed
value of initial squeezing in the TMSV state, the states produced
by the non-Gaussian operations are more robust to loss, being
capable of generating higher key rates for a given loss. More
specifically, we find that for values of initial TMSV squeezing
below 1.5dB the highest key rates are obtained by means of
transmitter-QS. On the other hand, for squeezing above 1.5dB we
find that receiver-PS produces the best key rates. Our results will
be important for future CV-QKD implementations over free-space
channels, such as the satellite-Earth channel.
Brief Bio
Robert has been awarded a Double First-Class Honours BSc in physics and astronomy from the University of Glasgow, Scotland, and the Ph.D. in physics from the University of St. Andrews, Scotland. He was previously a NATO Postdoctoral Fellow for three years at the California Institute of Technology, a Postdoctoral Fellow for three years at the University of California at Berkeley, and a Senior Research Fellow for five years at the University of Toronto. He moved to Australia in 1998 becoming a Principal Research Scientist with the Australian Government National Research Laboratories - the CSIRO. He is currently an Associate Professor with the School of Electrical Engineering and Telecommunications, University of New South Wales (UNSW), Sydney, Australia. His research focusses on the intersection of classical and quantum communications, with an emphasis on satellite communications. He currently leads a group of 10 researchers in this area at UNSW. Robert has approximately 200 scientific publications and is a Senior Member of the IEEE. In recognition of his research achievements Robert was awarded in 2017 the Northrop Grumman Inaugural Professorial Award, presented by the Australian Education Minister, Senator Birmingham, at Parliament House, Canberra.