LPS Seminar: October 21 – Rusko Ruskov

October 8th, 2010  |  Published in All, Upcoming Talks

SPECIAL Laboratory for Physical Sciences Seminar Announcement

THURSDAY, October 21, 2010; 11 am

Seminar Room, Lower Level, LPS

8050 Greenmead Dr., College Park, MD 20740 301-935-6400

Title: Single-spin state monitoring by measurement of three complementary observables

Rusko Ruskov

Laboratory for Physical Sciences

Abstract:

We consider the evolution of a qubit (spin 1/2) under the simultaneous continuous measurement of three noncommuting qubit operators \sigma_x, \sigma_y, and \sigma_z. For identical ideal detectors, the qubit state evolves

by approaching a pure state with a random direction in the Bloch vector space and by undergoing locally isotropic diffusion in the perpendicular directions. The quantum state conditioned on the complete detector record is used to assess the fidelity of classically inspired estimates based on running time averages and discrete time bin detector outputs.

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