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FM: Fall Meeting

FM 18: Quantum Networks: Interfaces & Hybrid Systems

FM 18.6: Talk

Montag, 23. September 2019, 18:00–18:15, 1015

Quantum synchronization — •Christoph Bruder — Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel

Experimental progress in optomechanical systems, in trapped-ion setups, and in superconducting circuit-QED architectures has motivated the study of synchronization in quantum systems. This gives rise to a number of conceptual questions, like the relation between quantum synchronization and the generation of entanglement, and leads to paradoxial phenomena like the quantum synchronization blockade [1]. Recently, we have addressed the question what is the smallest possible system that can be synchronized. We have shown that whereas qubits cannot be synchronized due to the lack of a limit cycle, a single spin 1 can be phase-locked to a weak external signal of similar frequency and exhibits all the standard features of the theory of synchronization [2]. We have also studied synchronization in a two-node spin-1 network and have shown that phase locking between these quantum oscillators can be achieved even for limit cycles that cannot be synchronized to an external semi-classical signal [2]. Finally, we have explored the relation between quantum synchronization and the generation of entanglement. [1] N. Lörch, S.E. Nigg, A. Nunnenkamp, R.P. Tiwari, and C. Bruder, Phys. Rev. Lett. 118, 243602 (2017). [2] A. Roulet and C. Bruder, Phys. Rev. Lett. 121, 053601 (2018); ibid., 063601 (2018).