Ehud Amitai


Department of Physics
University of Basel
Klingelbergstrasse 82
CH-4056 Basel, Switzerland

email:view address

tel: +41 (0)61 267 36 53


2014 - Present    Ph.D student at the University of Basel, under the supervision of Prof. Dr. Christoph Bruder.
2012 - 2014 M.Sc at the Free University of Berlin. Master Thesis done under the supervision of Prof. Dr. Piet Brouwer and Dr. Dario Bercioux.
2007 - 2011 B.Sc at the Tel-Aviv University.

Research Interests


Show all abstracts.

1.  Quantum effects in amplitude death of coupled anharmonic self-oscillators
Ehud Amitai, Martin Koppenhoefer, Niels Loerch, and Christoph Bruder.
Phys. Rev. E 97, 052203 (2018); arXiv:1802.04640.

2.  Synchronization of an optomechanical system to an external drive
Ehud Amitai, Niels Loerch, Andreas Nunnenkamp, Stefan Walter, and Christoph Bruder.
Phys. Rev. A 95, 053858 (2017); arxiv:1703.04344.

Optomechanical systems driven by an effective blue detuned laser can exhibit self-sustained oscillations of the mechanical oscillator. These self-oscillations are a prerequisite for the observation of synchronization. Here, we study the synchronization of the mechanical oscillations to an external reference drive. We study two cases of reference drives: (1) An additional laser applied to the optical cavity; (2) A mechanical drive applied directly to the mechanical oscillator. Starting from a master equation description, we derive a microscopic Adler equation for both cases, valid in the classical regime in which the quantum shot noise of the mechanical self-oscillator does not play a role. Furthermore, we numerically show that, in both cases, synchronization arises also in the quantum regime. The optomechanical system is therefore a good candidate for the study of quantum synchronization.

3.  Genuine quantum signatures in synchronization of anharmonic self-oscillators
Niels Loerch, Ehud Amitai, Andreas Nunnenkamp, and Christoph Bruder.
Phys. Rev. Lett. 117, 073601 (2016); arxiv:1603.01409.

We study the synchronization of a van der Pol self-oscillator with Kerr anharmonicity to an external drive. We demonstrate that the anharmonic, discrete energy spectrum of the quantum oscillator leads to multiple resonances in both phase locking and frequency entrainment not present in the corresponding classical system. Strong driving close to these resonances leads to nonclassical steady-state Wigner distributions. Experimental realizations of these genuine quantum signatures can be implemented with current technology.

4.  Non local quantum state engineering with the Cooper pair splitter beyond the Coulomb blockade regime
Ehud Amitai, Rakesh P. Tiwari, Stefan Walter, Thomas L. Schmidt, and Simon E. Nigg.
Phys. Rev. B 93, 075421 (2016); arxiv:1512.02952.