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Physics Colloquium: Quantum synchronization

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Speaker: Prof. Christoph Bruder
Event date: Wednesday, 11 October 2017, 16:00 - 17:00
Place: Campus Limpertsberg, room BSC 1.04
162a, Avenue de la Faïencerie
L-1511 Luxembourg

Synchronization of self-oscillators is a universal phenomenon that is important both in fundamental studies and in technical applications.
Recent experimental progress in optomechanical systems has motivated the study of synchronization in quantum systems. I will discuss some approaches to this question and will then describe our own work [1-3].
We have studied the synchronization of a van der Pol self-oscillator with Kerr anharmonicity to an external drive [1,2] and have shown that this system exhibits genuine quantum signatures like multiple resonances in both phase locking and frequency entrainment not present in the corresponding classical system. Recently, we have predicted a novel quantum phenomenon in synchronization which we called quantum synchronization blockade [3]. Classically, the tendency towards spontaneous synchronization is strongest if the natural frequencies of the self-oscillators are as close as possible. We have shown that this wisdom fails in the deep quantum regime, where the uncertainty of amplitude narrows down to the level of single quanta. Under these circumstances identical self-oscillators cannot synchronize and detuning their frequencies can actually help synchronization.
[1] S. Walter, A. Nunnenkamp, and C. Bruder, Phys. Rev. Lett. 112, 094102 (2014)
[2] N. L\"orch, E. Amitai, A. Nunnenkamp, and C. Bruder, Phys. Rev. Lett. 117, 073601 (2016)
[3] N. L\"orch, S.E. Nigg, A. Nunnenkamp, R.P. Tiwari, and C. Bruder, Phys. Rev. Lett. 118, 243602 (2017).

Data: 2017_10_11_Christoph Bruder_PC.pdf 27.71 kB