Itay Shomroni

Itay Shomroni
Experienced Researcher
EPFL

 

Academic background

2014    Ph.D. in Physics, Weizmann Institute of Science, Israel
Thesis: All-Optical Single Photon Switch Based on a Single Atom
Advisor: Dr. Barak Dayan

2008    M.Sc. in Physics, Technion, Israel Institute of Technology
Thesis: Observation of the d.c. Josephson effect in a Bose-Einstein condensate
Advisor: Dr. Jeff Steinhauer

2000    B.Sc. in Physics and Computer Science, Tel-Aviv University, Israel.

Current Research Topic

My research concerns realizing non-classical states in mechanical oscillators. Specifically, our research aim to create a single phonon Fock state of a mechanical mode. Such a state can be created using heralding techniques, as has been analyzed theoretically in our group: Staring for the oscillator ground state and working in the resolved-sideband regime, a single ‘write’ photon, tuned to the blue sideband, may leave the oscillator in a non-classical singly-excited Fock state, while generating a down-converted photon heralding the process. Subsequent reading of the mechanical state is possible via a ‘read’ photon tuned to the read sideband, imprinting the mechanics on up-converted photons. In analogy to early experiments in quantum optics, that demonstrated the quantum nature of light via fluorescence from single atoms, the quantum nature of mechanical oscillators is revealed in the statistical correlations of the readout light, which would violate classicality by exhibiting anti-bunching and sub-Poissoninan statistics.

We implement photonic crystal nanomechanical oscillators due to their gigahertz-scale mechanical frequency (resulting in high resolved sideband factor), high optical and mechanical Q-factors and excellent optomechanical coupling. The high frequency also enables reaching extremely low thermal occupation simply by cryogenically cooling the devices. Our experiments are carried out in a He3 cryostat at 600 mK where thermal occupation is ~2 quanta, facilitating further optomechanical cooling.

Achieving a single-phonon Fock state of a mechanical oscillator will advance the understanding of the quantum nature of macroscopic objects and facilitate using such systems for quantum information processing.

Publications

  1. Rosenblum, O. Bechler, I. Shomroni, Y. Lovsky, G. Guendelman, and B. Dayan. Extraction of a single photon from an optical pulse. Nat. Phot., 10, 19–22, January 2016.
  2. Shomroni, S. Rosenblum, Y. Lovsky, O. Bechler, G. Guendelman, and B. Dayan. All-optical routing of single photons by a one-atom switch controlled by a single photon. Science, 345(6199):903–906, August 2014.
  3. Shomroni, O. Bechler, S. Rosenblum, and B. Dayan. Demonstration of weak measurement based on atomic spontaneous emission. Physical Review Letters, 111(2):023604+, July 2013.
  4. Shomroni, E. Lahoud, S. Levy, and J. Steinhauer. Evidence for an oscillating soliton/vortex ring by density engineering of a Bose-Einstein condensate. Nature Physics, 5(3):193–197, March 2009.
  5. Levy, E. Lahoud, I. Shomroni, and J. Steinhauer. The a.c. and d.c. Josephson effects in a Bose-Einstein condensate. Nature, 449(7162):579–583, October 2007.
  6. Rosenblum, O. Bechler, I. Shomroni, R. Kaner, T. Arusi-Parpar, O. Raz, and B. Dayan. Demonstration of fold and cusp catastrophes in an atomic cloud reflected from an optical barrier in the presence of gravity. Physical Review Letters, 112(12):120403+, March 2014.
  7. I. Viza, J. Martínez-Rincón, G. A. Howland, H. Frostig, I. Shomroni, B. Dayan, and J. C. Howell. Weak-values technique for velocity measurements. Optics Letters, 38(16):2949–2952, August 2013.
  8. Giner, L. Veissier, B. Sparkes, A. S. Sheremet, A. Nicolas, O. S. Mishina, M. Scherman, S. Burks, I. Shomroni, D. V. Kupriyanov, P. K. Lam, E. Giacobino, and J. Laurat. Experimental investigation of the transition between Autler-Townes splitting and electromagnetically-induced-transparency models. Physical Review A, 87:013823, January 2013.
  9. Fekete and I. Shomroni. InGaAs/GaAs 0.98µm low-divergence central-lobe semiconductor lasers with δ-doped resonant tunneling quantum wells. IEEE Journal of Quantum Electronics, 45(6):700–710, June 2009.

 

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