Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 41: Quantum information: Concepts and methods III
Q 41.7: Vortrag
Mittwoch, 20. März 2013, 15:45–16:00, E 214
Quasi phase-locking without a phase reference — •Christian R. Müller1,2, Petr Marek3, Radim Filip3, Christoph Marquardt1,2, and Gerd Leuchs1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Department of Physics, University of Erlangen-Nuremberg, Germany — 3Department of Optics, Palacký University, Olomouc, Czech Republic
The common approach to lock the phases of two quantum states is to individually couple them to a phase reference, e.g. a bright local oscillator, which can then directly be locked. However, if a bright phase reference cannot be provided the phase information is typically insufficient to stabilize the relative phase. We show that the phases of the quantum states can still be aligned to, in principle, arbitrary accuracy by allowing for probabilistic operation. This is achieved by measuring the freely drifting interference of the weak phase references by a photon number resolving detector and heralding the locked states based on the detected number of photons. Interestingly, not only the phase but all other degrees of freedom are also locked.