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Thursday, September 6, 2012 12:00 pm - 12:15 pm EDT (GMT -04:00)

Chris Sutherland: Mode Mismatch in a Mutually Unbiased Basis Measurement Scheme

Chris Sutherland, Institute for Quantum Computing (IQC)

Abstract

Quantum cryptography protocols for qudit systems have been well established, but the ways to implement a mutually unbiased basis measurement have not been. In this talk I will describe the proposed measurement scheme, and also describe how to account for the common experimental challenge of mode-mismatch between two distinct laser pulses. I will also show how this effects the result of the measurement, and how much mode mismatch can be tolerated.

Monday, October 1, 2012 12:30 pm - 1:30 pm EDT (GMT -04:00)

Simon Phoenix: Quantum Keys - Are They Just a Flash in the Security Pan

Simon Phoenix, Khalifa University

Abstract

The birth of quantum key distribution (QKD) 2 decades ago was accompanied by headlines the world over that the age of perfect security had finally dawned. The media, not noted for its restraint, can be forgiven. But so, too, can the physicists who, by and large, spawned such claims. In the cut-throat world of research funding, quantum key distribution was a godsend. I played the game too.

Thursday, October 4, 2012 12:00 pm - 1:00 pm EDT (GMT -04:00)

Tobias Moroder: Detection of systematic errors in quantum experiments

Abstract

When systematic errors are ignored in an experiment, the subsequent analysis of its results becomes questionable. We develop tests to identify systematic errors in experiments where only a finite amount of data is recorded and apply these tests to tomographic data taken in an ion-trap experiment. We put particular emphasis on quantum state tomography and present two detection methods: the first employs linear inequalities while the second is based on the generalized likelihood ratio.

Monday, October 22, 2012 12:30 pm - 1:30 pm EDT (GMT -04:00)

Patryk Gumann: Nuclear Spin Polarization of low concentration of 31-P in Silicon

Patryk Gumann, IQC

Abstract

Nuclear magnetic resonance (NMR) signal of phosphorus donors ($^{31}$P) in a single crystal of silicon, concentration 6 x 10$^{15}$ cc$^{-1}$ has been measured. The obtained polarization is larger than the expected thermal equilibrium polarization within the time scale of the experiment. A 13 sec build up time a probable nonequilibrium Overhauser mechanism, driven by 1047 nm light irradiation. This polarization is reached a temperature of 4.2 K and a magnetic field of 9.4 T.