# Theoretical Physics

**31 October 2012**

**Time:**15:00 to 16:00

**Location:**SR 8.60

Jason Ralph (Liverpool)

Tracking continuous weak quantum measurements - How much information is in a qubit?

We discuss the purification of a quantum state using a continuous weak measurement record, where the information content of the measurement record is reduced, either by filtering or digitising to a small number of bits per measurement. This information reduction is applied to the

classical measurement record after the measurements have been made. Calculations indicate that efficient and reliable state purification is achievable for one-qubit and two-qubit systems with a remarkably low data rate. We also comment on the minimum amount of information required to purify a qubit using a continuous weak measurement record.

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