Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster: Quantum Optics and Photonics III
Q 42.2: Poster
Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof
Quantum-phase synchronization — •Lukas Fiderer1, Marek Kus2, and Daniel Braun1 — 1Eberhard-Karls-Universität Tübingen, 72076 Tübingen, Germany — 2Center for Theoretical Physics of the Polish Academy of Sciences, 02-068 Warsaw, Poland
We study mechanisms that allow one to synchronize the quantum phase of two qubits relative to a fixed basis. Starting from one qubit in a fixed reference state and the other in an unknown state, we find that contrary to the impossibility of perfect quantum cloning, the quantum-phase can be synchronized perfectly through a joined unitary operation. When both qubits are initially in a pure unknown state, perfect quantum-phase synchronization through unitary operations becomes impossible. In this situation we determine the optimal average quantum-phase synchronization fidelity, the distribution of relative phases and fidelities, and identify quantum circuits that enable this optimal fidelity. A subset of these optimal quantum circuits achieves perfect quantum-phase synchronization for a class of unknown initial states restricted to the equatorial plane of the Bloch sphere.