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Q: Fachverband Quantenoptik und Photonik
Q 33: Quantum information: Concepts and methods II
Q 33.2: Talk
Tuesday, March 19, 2013, 14:15–14:30, E 214
The Power of Combining Coherent Control with Switchable Noise — •Thomas Schulte-Herbrüggen1 and Ville Bergholm1,2 — 1Dept. Chem., TU-München (TUM) — 2Institute for Scientific Interchange Foundation (ISI), Torino
Adding bang-bang switchable noise on a single qubit (out of a total of n) on top of unitary control seems magic: this simple add-on suffices for transforming any initial quantum state into any desired target state.
We have extended our open-loop optimal control algorithm (dynamo) by such degrees of incoherent control so that these unprecedented reachable sets can systematically be exploited in experiments [1]. As illustrated for an ion trap experimental setting, open-loop control with noise switching can accomplish all state transfers one can get by the more complicated measurement-based closed-loop feedback schemes [2,3] requiring a resettable ancilla qubit.
[1] V. Bergholm and T. Schulte-Herbrüggen, arXiv/1206.4945 (2012)
[2] S. Lloyd and L. Viola, Phys. Rev. A 65, 010101 (2001)
[3] J. Barreiro et al., Nature 470, 486 (2011)