Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 43: Quantum information: Concepts and methods II
Q 43.6: Talk
Thursday, March 20, 2014, 15:30–15:45, Kinosaal
Time-Continuous Bell Measurements — •Denis Vasilyev1, Sebastian Hofer2, Markus Aspelmeyer2, and Klemens Hammerer1 — 1ITP, Leibniz University Hannover, Germany — 2VCQ, University of Vienna, Austria
We combine the concept of Bell measurements, in which two systems are projected into a maximally entangled state, with the concept of continuous measurements, which concerns the evolution of a continuously monitored quantum system. For such time-continuous Bell measurements we derive the corresponding stochastic Schrödinger equations, as well as the unconditional feedback master equations [1].
Our results apply to a wide range of physical systems, and are easily adapted to describe an arbitrary number of systems and measurements. Time-continuous Bell measurements therefore provide a versatile tool for the control of complex quantum systems and networks. As examples we show that (i) two two-level systems can be deterministically entangled via homodyne detection, tolerating photon loss up to 50%, and (ii) a quantum state of light can be continuously teleported to a mechanical oscillator, which works under the same conditions as are required for optomechanical ground-state cooling.
[1] PRL 111, 170404 (2013)