Dr Eran Ginossar

Lecturer

Email:
Phone: Work: 01483 68 2714
Room no: 20 ATI 02

Office hours

Please e-mail me to schedule a meeting or regarding applications for PhD.

Further information

Biography

Eran Ginossar grew up in Israel, where he obtained his BSc in Physics from Tel-Aviv University. During his graduate
studies at the Weizmann Institute of Science in Rehovot he worked on extending the theory of optical spin
orientation of direct gap semiconductors to include the fluctuations of the light and of the spins. After receiving
his PhD in 2008 he moved to Yale University to study the physics of superconducting circuits, a field that is
rapidly progressing in creating viable devices for quantum information processing. Additional topics of interest
include interaction effects in mesoscopic systems, quantum optics and quantum simulations. Eran has joined the
Department of Physics and the Advanced Technology Institute at the University of Surrey in 2011. He is a member of
the APS and an EPSRC fellow.

Research Interests

Circuit Quantum Electrodynamics: Measurement theory and control of Qubits and Resonators. These projects are geared towards developing the building blocks and protocols for quantum information processing with solid state devices. My research in this field is strongly motivated by experiments which routinely raise research questions in quantum optics and coherent control. The methodology involves taking a non-equilibrium open system approach to modeling and employing large scale computer simulations.

Semiconductor quantum optics: The theory of optical spin orientation of direct gap semiconductors can include the fluctuations of the light and of the spins. Our analysis treats the effects of optical photonic correlations, present in down converted light, on the collective fluctuations of the spins excited by the light. This shows a possibility to control the temporal fluctuations of the collective electronic spin in actual semiconductor devices, demonstrating that quantum optical effects can appear in the optical absorption of squeezed light by a semiconductor.

Mesoscopic physics: Electronic interferometers in the quantum Hall state, persistent currents in normal metal rings, random lasers.

Publications

Suppression of the radiative decay of atomic coherence in squeezed vacuum  arXiv:1301.6276
Observation of quantum state collapse and revival due to the single-photon Kerr effect arXiv:1211.2228 

Highlights

  • Bishop LS, Ginossar E, Girvin SM. (2010) 'Response of the strongly driven Jaynes-Cummings oscillator.'. American Physical Society Phys Rev Lett, United States: 105 (10) Article number 100505

    Abstract

    We analyze the Jaynes-Cummings model of quantum optics, in the strong-dispersive regime. In the bad-cavity limit and on time scales short compared to the atomic coherence time, the dynamics are those of a nonlinear oscillator. A steady-state nonperturbative semiclassical analysis exhibits a finite region of bistability delimited by a pair of critical points, unlike the usual dispersive bistability from a Kerr nonlinearity. This analysis explains our quantum trajectory simulations that show qualitative agreement with recent experiments from the field of circuit quantum electrodynamics.

  • Ginossar E, Bishop LS, Schuster DI, Girvin SM. (2010) 'Protocol for high-fidelity readout in the photon-blockade regime of circuit QED'. AMER PHYSICAL SOC PHYSICAL REVIEW A, 82 (2) Article number ARTN 022335
  • Bleszynski-Jayich AC, Shanks WE, Peaudecerf B, Ginossar E, von Oppen F, Glazman L, Harris JG. (2009) 'Persistent currents in normal metal rings.'. Science, United States: 326 (5950), pp. 272-275.
  • Neder I, Ginossar E. (2008) 'Behavior of electronic interferometers in the nonlinear regime.'. American Physical Society Phys Rev Lett, United States: 100 (19) Article number 196806

    Abstract

    We investigate theoretically the behavior of the current oscillations in an electronic Mach-Zehnder interferometer (MZI) as a function of its source bias. Recently, the MZI visibility data showed an unexplained lobe pattern with a peculiar phase rigidity. Moreover, the effect did not depend on the MZI path length difference. We argue that these effects may be a new many-body manifestation of particle-wave duality in quantum mechanics. When biasing the interferometer sources so much that multiple electrons are on each arm at any instant in time, quantum shot noise (a particle phenomena) must affect the interference pattern of the electrons that create it. A solution to the interaction Hamiltonian presented here shows that the interference visibility has a lobe pattern with applied bias that has a period proportional to the average path length and independent of the path length difference, together with a phase rigidity.

Journal articles

  • Kirchmair G, Vlastakis B, Leghtas Z, Nigg SE, Paik H, Ginossar E, Mirrahimi M, Frunzio L, Girvin SM, Schoelkopf RJ. (2012) 'Observation of quantum state collapse and revival due to the single-photon Kerr effect'.
  • Murch KW, Ginossar E, Weber SJ, Vijay R, Girvin SM, Siddiqi I. (2012) 'Quantum State Sensitivity of an Autoresonant Superconducting Circuit'. Physics Review B,

    Abstract

    When a frequency chirped excitation is applied to a classical high-Q nonlinear oscillator, its motion becomes dynamically synchronized to the drive and large oscillation amplitude is observed, provided the drive strength exceeds the critical threshold for autoresonance. We demonstrate that when such an oscillator is strongly coupled to a quantized superconducting qubit, both the effective nonlinearity and the threshold become a non-trivial function of the qubit-oscillator detuning. Moreover, the autoresonant threshold is sensitive to the quantum state of the qubit and may be used to realize a high fidelity, latching readout whose speed is not limited by the oscillator Q.

  • Schuster DI, Sears AP, Ginossar E, DiCarlo L, Frunzio L, Morton JJ, Wu H, Briggs GA, Buckley BB, Awschalom DD. (2010) 'High-cooperativity coupling of electron-spin ensembles to superconducting cavities.'. American Physical Society Phys Rev Lett, United States: 105 (14) Article number 140501

    Abstract

    Electron spins in solids are promising candidates for quantum memories for superconducting qubits because they can have long coherence times, large collective couplings, and many qubits could be encoded into spin waves of a single ensemble. We demonstrate the coupling of electron-spin ensembles to a superconducting transmission-line cavity at strengths greatly exceeding the cavity decay rates and comparable to the spin linewidths. We also perform broadband spectroscopy of ruby (Al₂O₃:Cr(3+)) at millikelvin temperatures and low powers, using an on-chip feedline. In addition, we observe hyperfine structure in diamond P1 centers.

  • Johnson BR, Reed MD, Houck AA, Schuster DI, Bishop LS, Ginossar E, Gambetta JM, DiCarlo L, Frunzio L, Girvin SM, Schoelkopf RJ. (2010) 'Quantum non-demolition detection of single microwave photons in a circuit'. NATURE PUBLISHING GROUP NATURE PHYSICS, 6 (9), pp. 663-667.
  • Bishop LS, Ginossar E, Girvin SM. (2010) 'Response of the strongly driven Jaynes-Cummings oscillator.'. American Physical Society Phys Rev Lett, United States: 105 (10) Article number 100505

    Abstract

    We analyze the Jaynes-Cummings model of quantum optics, in the strong-dispersive regime. In the bad-cavity limit and on time scales short compared to the atomic coherence time, the dynamics are those of a nonlinear oscillator. A steady-state nonperturbative semiclassical analysis exhibits a finite region of bistability delimited by a pair of critical points, unlike the usual dispersive bistability from a Kerr nonlinearity. This analysis explains our quantum trajectory simulations that show qualitative agreement with recent experiments from the field of circuit quantum electrodynamics.

  • Ginossar E, Bishop LS, Schuster DI, Girvin SM. (2010) 'Protocol for high-fidelity readout in the photon-blockade regime of circuit QED'. AMER PHYSICAL SOC PHYSICAL REVIEW A, 82 (2) Article number ARTN 022335
  • Ginossar E, Glazman LI, Ojanen T, von Oppen F, Shanks WE, Bleszynski-Jayich AC, Harris JGE. (2010) 'Mesoscopic persistent currents in a strong magnetic field'. AMER PHYSICAL SOC PHYSICAL REVIEW B, 81 (15) Article number ARTN 155448
  • Bleszynski-Jayich AC, Shanks WE, Peaudecerf B, Ginossar E, von Oppen F, Glazman L, Harris JG. (2009) 'Persistent currents in normal metal rings.'. Science, United States: 326 (5950), pp. 272-275.
  • Bishop LS, Tornberg L, Price D, Ginossar E, Nunnenkamp A, Houck AA, Gambetta JM, Koch J, Johansson G, Girvin SM, Schoelkopf RJ. (2009) 'Proposal for generating and detecting multi-qubit GHZ states in circuit QED'. IOP PUBLISHING LTD NEW JOURNAL OF PHYSICS, 11 Article number ARTN 073040
  • Ginossar E, Levinson Y, Levit S. (2008) 'Coherent optical control of correlation waves of spins in semiconductors'. AMER PHYSICAL SOC PHYSICAL REVIEW B, 78 (20) Article number ARTN 205204
  • Neder I, Ginossar E. (2008) 'Behavior of electronic interferometers in the nonlinear regime.'. American Physical Society Phys Rev Lett, United States: 100 (19) Article number 196806

    Abstract

    We investigate theoretically the behavior of the current oscillations in an electronic Mach-Zehnder interferometer (MZI) as a function of its source bias. Recently, the MZI visibility data showed an unexplained lobe pattern with a peculiar phase rigidity. Moreover, the effect did not depend on the MZI path length difference. We argue that these effects may be a new many-body manifestation of particle-wave duality in quantum mechanics. When biasing the interferometer sources so much that multiple electrons are on each arm at any instant in time, quantum shot noise (a particle phenomena) must affect the interference pattern of the electrons that create it. A solution to the interaction Hamiltonian presented here shows that the interference visibility has a lobe pattern with applied bias that has a period proportional to the average path length and independent of the path length difference, together with a phase rigidity.

  • Ginossar E, Levinson Y, Levit S. (2008) 'Optical manipulation of collective spin correlations in semiconductors with a squeezed vacuum of polarized photons'. AMER PHYSICAL SOC PHYSICAL REVIEW B, 77 (3) Article number ARTN 035307
  • Rabinak I, Ginossar E, Levit S. (2007) 'Atom in a coherently controlled squeezed vacuum'. AMER PHYSICAL SOC PHYSICAL REVIEW A, 76 (1) Article number ARTN 013821
  • Ginossar E, Levit S. (2005) 'Semiconductor Microstructure in a Squeezed Vacuum: Electron-Hole Plasma Luminescence'. American Physical Society Physical Review B (Condensed Matter and Materials Physics), 72 (7) Article number 075333

    Abstract

    We consider a semiconductor quantum-well placed in a wave guide microcavity and interacting with the broadband squeezed vacuum radiation, which fills one mode of the wave guide with a large average occupation. The wave guide modifies the optical density of states so that the quantum well interacts mostly with the squeezed vacuum. The vacuum is squeezed around the externally controlled central frequency $\om_0$, which is tuned above the electron-hole gap $E_g$, and induces fluctuations in the interband polarization of the quantum-well. The power spectrum of scattered light exhibits a peak around $\om_0$, which is moreover non-Lorentzian and is a result of both the squeezing and the particle-hole continuum. The squeezing spectrum is qualitatively different from the atomic case. We discuss the possibility to observe the above phenomena in the presence of additional non-radiative (e-e, phonon) dephasing.

Book chapters

  • Ginossar E, Bishop LS, Girvin SM. (2012) 'Nonlinear oscillators and high fidelity qubit state measurement in circuit quantum electrodynamics'. in (ed.) Fluctuating Nonlinear Oscillators. From nanomechanics to quantum superconducting circuits Oxford University Press Article number 8

Internet publications

  • Belinicher V, Ginossar E, Levit S. (2001) Universal Features of Interacting Chaotic Quantum Dots. Application to Statistics of Coulomb Blockade Peak Spacings.

    Abstract

    We present a complete classification of the electron-electron interaction in chaotic quantum dots based on expansion in inverse powers of $1/M$, the number of the electron states in the Thouless window, $M \simeq k_F R$. This classification is quite universal and extends and enlarges the universal non interacting RMT statistical ensembles. We show that existing Coulomb blockade peak spacing data for $B=0$ and $B\ne 0$ is described quite accurately by the interacting GSE and by its extension to $B\ne 0$. The bimodal structure existing in the interacting GUE case is completely washed out by the combined effect of the spin orbit, pairing and higher order residual interactions.

Teaching

Level 1 Essential Mathematics

There are Ph.D. positions available see

http://www.surrey.ac.uk/ati/tac/activity/projects/

and please e-mail enquires to e.ginossar@surrey.ac.uk