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Efficient conditional preparation of single photons for quantum optica

Walmsley, IA (Oxford)
Wednesday 29 September 2004, 14:00-14:45

Seminar Room 1, Newton Institute


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.


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