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Efficient conditional preparation of single photons for quantum optica

Presented by: 
IA Walmsley [Oxford]
Date: 
Wednesday 29th September 2004 - 14:00 to 14:45
Venue: 
INI Seminar Room 1
Abstract: 

In this talk I will explore connections between quantum error correction and closed-loop quantum feedback. A simple model, based on detected measurement errors, in which the measurements are continuous in time will be presented. Error correction is implemented using the Poisson process feed-back model. I will also discuss a new scheme based on continuous measurement and feed-back that can increase the coherence time for a single encoded qubit. Finally I will discuss schemes that explicitly use decoherence for ancilla qubits, without reference to an explicit measured signal. These show how quantum closed-loop control may be used to increase the coherence time of encoded qubits.

Presentation Material: 
University of Cambridge Research Councils UK
    Clay Mathematics Institute London Mathematical Society NM Rothschild and Sons