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QCIS Seminar: Observation of quasiperiodic dynamics in a one-dimensional quantum walk of a single photon in space, by Prof Peng Xue, Southeast University, China

Presenter: Prof Peng Xue, Southeast University, Nanjing, China (invited by Prof Runyao Duan)

Abstract: Optical interferometers comprising birefringent-crystal beam displacers, wave plates, and phase shifters serve as stable devices for simulating quantum information processes such as heralded coined quantum walks. Quantum walks are important for quantum algorithms, quantum transport in complex systems, and demonstrating intriguing nonlinear dynamic quantum phenomena. We introduce fully controllable polarization-independent phase shifters in every optical path in order to realize arbitrary phase shifts for each optical path. The effectiveness of our interferometer is demonstrated by realising hitherto unobserved single-photon quantum-walk quasi-periodic dynamics in one dimension, with this quasi-periodicity caused by a position-dependent phase function. By simulating quantum walk evolution all the way to 10 steps, we are able to realise walker dynamics over 2.5 quasi-periods, which is long enough to unambiguously ascertain the quasi-period, and furthermore, to control the transition rate from quasi-periodic dynamics to ballistic diffusion by modifying the quantum-coin bias, by varying the half-wave plate setting.

Short Bio:  Dr Peng Xue is a Professor at the Physics Department at Southeast University, Nanjing, China. Dr Xue received her Bachelor of Science degree in 1999 and a PhD in 2004 from the University of Science and Technology, China, supervised by Professor Guang-Can Guo. Her postdoctoral research was supervised by Professor Peter Zoller and Hans J Briegel at the University of Innsbruck, Austria, and then at the University of Calgary, Canada, by Professor Barry C Sanders. Dr Xue joined the Physics Department at Southeast University in 2009.

Dr Xue's current research interests belong, in a broad sense, to the field of physical implementation of quantum computing and quantum simulation ideas, especially experimental realisation of quantum information processing with linear optics. Apart from the design of interactions and quantum gates, this research also includes the analysis of decoherence sourcs,e as well as state preparation and measurement techniques as prerequisites for quantum computations. Due to the interdisciplinary character of this research field she has become interested in various physical systems, from the field of linear optics, the field of atomic, molecular and optical physics, as well as the field of solid state physics.

 

Date:
29 November 2013
Time:
11:00 - 12:30
Location:
City - Broadway CB01 Tower Level 4, Room 6
Audience:
All Welcome
Contact:
Barbara Munday

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