Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics III

Q 58.8: Poster

Thursday, March 14, 2019, 16:15–18:15, S Atrium Informatik

Quantum optimal control of the dissipative production of a maximally entangled state — •Karl Horn¹, Florentin Reiter², Yiheng Lin^3,4, Dietrich Leibfried⁵, and Christiane P. Koch¹ — ¹Theoretische Physik, Universität Kassel, Heinrich-Plett-Straße 40, D-34132 Kassel,Germany — ²Department of Physics, Harvard University, Cambridge, MA 02138, USA — ³CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China — ⁴Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China — ⁵National Institute of Standards and Technology, Boulder, Colorado 80305, USA

Entanglement generation can be robust against certain types of noise in approaches that deliberately incorporate dissipation into the system dynamics. The presence of additional dissipation channels may, however, limit fidelity and speed of the process. Here we show how quantum optimal control techniques can be used to both speed up the entanglement generation and increase the fidelity in a realistic setup, whilst respecting typical experimental limitations. For the example of entangling two trapped ion qubits [Lin et al., Nature 504, 415 (2013)], we find an improved fidelity by simply optimizing the polarization of the laser beams utilized in the experiment. More significantly, an alternate combination of transitions between internal states of the ions, when combined with optimized polarization, enables faster entanglement and decreases the error by an order of magnitude.