Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 73: Quantum Dynamics, Decoherence and Quantum Information (joint session DY/TT)
TT 73.2: Talk
Wednesday, March 14, 2018, 15:45–16:00, EB 107
Optimized polarization control in a Central-Spin System — •Alessandro Ricottone1, Yi Nan Fang2, Stefano Chesi2, and William Coish1 — 1Department of Physics, McGill University, Montréal, Québec H3A 2T8, Canada — 2Beijing Computational Science Research Center, Beijing 100084, China
We study the dissipative dynamics of the central-spin system, where one central spin is homogeneously coupled with many ancilla spins. We find that, due to a combination of the quantum Zeno effect and many-body collective behaviour of the ancilla spins, the dissipation rate can be optimized to minimize the time scale for polarization dynamics. An archetypical example of this model is given by an electron spin coupled to nuclear spins in a quantum dot via hyperfine interactions, but the same Hamiltonian can be applied in many other physical scenarios. These results may be important for protocols to quickly polarize nuclear spins in semiconductor quantum dots or to rapidly and efficiently equilibrate a quantum annealer.