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Current Activities

Past and future topics of the Quantum Optics Meeting, held every week, Thu 11:30h in the Theory Group Seminar Room B2.46.
 To receive announcements related to the quantum optics seminar, send a mail (with body subscribe qo-theory) to majordomo@rzg.mpg.de.

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Schedule

  • 09.06. Anika: tutorial "Master Equation I"
  • 02.06. holiday (Christ Ascension)
  • 26.05. group workshop in Seefeld
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Group Workshop Preparation

We have picked the following four topics for the workshop planned in 2011:

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Suggested Topics

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Suggested book chapters:

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Suggested articles

  • Reconstruction of non-classical cavity field states with snapshots of their decoherence Samuel Deléglise, Igor Dotsenko, Clément Sayrin, Julien Bernu, Michel Brune, Jean-Michel Raimond, Serge Haroche, Nature 455, 510-514 (2008)(16.07., interested: Christine)
  • Holographic Quantum ComputingKarl Tordrup, Antonio Negretti, and Klaus Mølmer, Phys. Rev. Lett. 101, 040501 (2008)(16.07., interested: Christine)
  • Strong dissipation inhibits losses and induces correlations in cold molecular gases N. Syassen, D. M. Bauer, M. Lettner, T. Volz, D. Dietze, J. J. García-Ripoll, J. I. Cirac, G. Rempe, S. Dürr Science 320, 1329 (2008).(interested: Christine, 11.05)
  • Cavity QED in a molecular ion trap D. I. Schuster, L. S. Bishop, I. L. Chuang, D. DeMille, and R. J. Schoelkopf arXiv:0903.3552. (interested: Lucas, 11.05)
  • Quantum computing with an electron spin ensemble J. H. Wesenberg, A. Ardavan, G. A. D. Briggs, J. J. L. Morton, R. J. Schoelkopf, D. I. Schuster, and K. Molmer, arXiv:0903.3506. (interested: Lucas, 11.05; Geza (what's the difference to Ref.[17]?)
  • Optically controlled locking of the nuclear field via coherent dark-state spectroscopy, Xu et al., Nature 459, 1105-1109 (2009) (interested: Geza (14.7.))
  • Quantum coherence and entanglement in the avian compass, Rieper et al., arXix:0906.3725 (interested: Geza (14.7.))
  • * Strong coupling of a mechanical oscillator and a single atom", K. Hammerer et al., [1]. Connected with [2] (interested: Ines (17.7.))
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Suggested general/review topics:

(some of these may be broad enough to be suited for coordinated talks by two speakers)

  • Basics on Cavity QED, (interested: Oriol, Christine,Ines 11.05)
  • Summary of Laser Cooling Techniques: enumeration, basic description, and temperature achieved, (interested: Oriol, Lucas, 11.05)
  • Quantum Phase Transitions (11.05., interested: Susanne, Eric,Ines)
  • Linear Optics Quantum Computing: state of the (theoretical and experimental) art (11.05., interested: Susanne, Geza, Christine)
  • Quantum Optics with Carbon Nanotubes: achievements and prospects (11.05., interested: Geza, Eric)
  • Not real QO but still: Percolation theory for Dummies (13.05., interested: Eric; I'd like to prepare this (Geza))
  • Basis on non-linear optics. (17.07. interested: Ines)
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past suggestions

  1. Nielsen,Chuang: Chapter 1.4 "Quantum algorithms" (14 pages)
  2. Nielsen, Chuang: Chapter 6 "Quantum search algorithms" (23 pages, maybe enough for two Monday meetings)
  • Quantum Cryptography
  • Two papers on NV-centers: an experimental one: Multipartite Entanglement Among Single Spins in Diamond, Neumann et al. (Wrachtrup group) [ Science 320 1326 (2008)] and a proposal: High-sensitivity diamond magnetometer with nanoscale resolution Taylor et al. (Lukin group) arXiv:0805.1367v1 [cond-mat.mes-hall]. [Also a good starting point is the first demonstration of a room-temperature solid state quantum register: Coherent Dynamics of Coupled Electron and Nuclear Spin Qubits in Diamond, Childress et al. (Lukin group) Science 314, 281 (2006)]
  • Quantum State Engineering and Precision Metrology using State-Insensitive Light Traps, Ye et al. (Kimble group), ArXiv:0804.0254
  • Quantum Interface for Nanomechanics and Atomic Ensembles, Hammerer et al. (Zoller group) ArXiv:0804.3005
  • "Bang-Bang control [3]" vs. optimal control (using soft pulses e.g. [4]).


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Older Talks

  • 02.12. Abstract Session:

Heike: Brown et al.,. Coherent state transfer between and electron-and nuclear spin in 15N@C60

Lucas Lamata: Klaers et al.,. Bose–Einstein condensation of photons in an optical microcavity

  • 15.10., 13:30h Lucas Clemente: Levitation of Superconductors
  • 30.07. Anika: Li et al., Measurement of the Instantaneous Velocity of a Brownian Particle
  • 10:00h, 23.07. Dominic: DLCZ quantum repeater
  • 02.07. Heike: Wesenberg et al.,. Quantum computing with an electron spin ensemble
  • 02.07. Lucas: Efficient quantum memory for light Nature 465, 1052–1056 (2010)
  • 25.06. Eric: Laser Cooling of Solids to cryogenic temperatures Nature Photonics 4, 161 - 164 (2010)
  • 18.01. Lucas: R. Gerritsma et al., Quantum simulation of the Dirac equation Nature 463, 68 (2010), see also the theoretical proposal, Lamata et al., Dirac Equation and Quantum Relativistic Effects in a Single Trapped Ion PRL 98, 253005 (2007).
  • 14.12. tba
  • 07.12. tba
  • 30.11. TT (Chairman Oriol)
  • 23.11. TT
  • 16.11. Think tank (TT)
  • 09.11. Eric
  • 26.10. Oriol
  • 12.10. Geza: Foletti et al., Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization Nature Physics AoP 12.10.2009
  • 14.09. Ines: review photonic crystals
  • 06.07. Lucas: Electromagnetically Induced Transparency and Light Storage in an Atomic Mott Insulator, U. Schnorrberger et al., arXiv:0903.0135.
  • 04.06. (Thursday 14pm!) brief reports on current work II
  • 25.05. brief reports on current work
  • 18.05. Oriol: Basics on Quantum Mechanical Resonators (13.05., interested: Inés, Christine)
  • 11.05. Christine: An Entanglement filter
  • 27.04. Heike: tba
  • 06.04. David Novoa (Facultade de Ciencias de Ourense): Dynamics of nonlinear beams in Cubic-Quintic optical media. Liquid light theory.
  • 30.03. Ines: The role of quantum coherence in photosyntesis.

See [5] for a recent experiment. Some theoretical proposals will also be discussed.

Ines: Baudon et al., Negative-index media for matter-wave optics, arXiv:0811.2479
Lucas and Eric: Weber et al., Photon-Photon Entanglement with a Single Trapped Atom, arXiv:0811.3612
Lucas: Imamoglu, arXiv:0809.2909v1 (quant-ph)
  • 03.11. Diego
  • 15.09. Quantum Coherence: Solid State Implementations II
Hanson & Awschalom Coherent manipulation of single spins in semiconductors (Eric)
  • summer break
  • 28.07. Quantum Coherence III: many body systems
Vedral Quantifying entanglement in macroscopic systems (Heike)
Bloch Quantum coherence and entanglement with ultracold atoms in optical lattices (Christine)
  • 21.07. Quantum Coherence II: Atomic Physics Implementations
Kimble The quantum internet (Ines)
  • 14.07. Quantum Algorithms II: Quantum Search (Nielsen/Chuang, ch. 6)
  • 07.07. Quantum Coherence I: Solid State Implementations
Clarke & Wilhelm Superconducting quantum bits (Lucas)
  • 30.06. Quantum Algorithms: Introduction (Nielsen and Chuang, ch. 1.4)
  • 02.06. Christine: Atom-Light interfaces
  • 26.05. Ines "Non Markovian Quantum Jumps", [6]
  • 19.05. Lucas: Nonlinear spectroscopy of photons bound to one atom , Nature Physics 4, 382 (2008)
  • 05.05. tba
  • 28.04. Heike: Nuclear Tuning and Detuning of the Electron Spin Resonance in a Quantum Dot: Theoretical Consideration PRL 100, 056603(2008)
  • 21.04. Eric / Geza
  • 14.04. abstracts
Heike: Spin entanglement using coherent light and cavity QED PRB 77, 165307(2008)
Lucas: Relativistically covariant state-dependent cloning of photons Phys. Rev. A 77, 042302 (2008)
  • 07.04. Tobias Schätz and Diego Porras
Simulating the Quantum Magnet Friedenauer et al., arXiv:0802.4072v1 [quant-ph]
  • 31.03. Ines: Quantum Repeaters IV (The Return) "Fault--tolerant Quantum Repeaters with Atomic Ensembles and Linear Optics" [7] and "Demonstration of a Stable Atom--Photon entanglement Source for Quantum Repeaters" [8]
by Zeng-Bing Chen et al.
  • 24.03. Easter Monday
  • 17.03. Fernando Pastawski (QIQFGBA, University of Buenos Aires)
Quantum Process Tomography - Motivating the use of randomness
Abstract: The characterization of the dynamics of quantum systems is one of the key problems quantum computation must overcome in order to become feasible. This problem consists on identifying and quantifying the terms involved in a systematic manner.
In this talk, a brief overview of the problem is given followed by the presentation of a new tomographic proposals. The presentation provides an information theoretic perspective aplicable to finite dimensional quantum systems. Tools such as 2-designs and mutually unbiased bases are introduced in order to justify tomographic protocols allowing selective and efficient quantum process tomography.
References: 1. Joseph Emerson, et. al., Symmetrized Characterization of Noisy Quantum Processes: Science 317, 1893 (2007).
2. M. Mohseni and D. A. Lidar, Direct characterization of quantum dynamics: Phys. Rev. Lett. 97, 170501 (2006).
3. Ariel Bendersky, Fernando Pastawski and Juan Pablo Paz, Selective Efficient Quantum Process Tomography: arXiv:0801.0758 (2008).
  • 10.03. abstracts
Christine: Spin squeezing of atomic ensembles via nuclear-electronic spin entanglement' arXiv:0802.2876 [quant-ph]
Geza: Fiber-Optical Analog of the Event Horizon Science 319 1367 (2008)
  • 03.03. Jose M. Villas-Boas (WSI)
Coherence and state control in self-assembled quantum dots system
Abstract: Semiconductor self-assembled quantum dots (QD), also known as artificial atom by their similarities, are nearly ideal systems in which to implement basic ideas of quantum system control and study the behavior under external probes and dephasing environments. In this talk I will give an overview of some of the works I developed as a post-doc at Ohio University and as a Humboldt fellow at WSI. I will initially review some basics concepts of optical quantum manipulation in this kind of QD, and follow with some of the relevant experimental advances used to address this task. The main part of the talk will center on the understanding of the coherent manipulation of excitonic and/or spin states in these artificial atoms and molecules and the various dephasing mechanisms present in these systems.
  • 25.02. abstracts
Eric: Emary and Sham, Optically controlled logic gates for two spin qubits in vertically coupled quantum dots Phys. Rev. B 75, 125317 (2007)
Lucas: Lanyon and Langford, Experimentally generating and tuning robust entanglement between photonic qubits, arXiv:0802.3161v1 [quant-ph]
Geza: Klauser et al., Nuclear spin dynamics and Zeno effect in quantum dots and defect centers, arXiv:0802.2463v1 [cond-mat.mes-hall]
  • 18.02. Geza: Quantum Repeaters II
  • 11.02. Christine: Quantum Repeaters I
  • 04.02. abstracts
Geza: Electrical Control of Spin Relaxation in a Quantum Dot Amasha et al., PRL 100 046803 (2008)
  • 28.01., 13:30h John Schliemann (Uni Regensburg)
Zitterbewegung and Ballistic Side Jump Motion in Semiconductor Structures
Abstract: Effects of spin-orbit coupling in semiconductors have attracted a very significant, partially also renewed, interest over the last years, mainly within the emerging field of spintronics. In this talk I will report on recent theoretical developments concerning zitterbewegung and side jump motion of electrons and holes in III-V semiconductor structures. In particullar, the relativistic effect of electronic zitterbewegung has been a long-standing theoretical prediction which was not observed experimentally so far. I will outline the perspectives to detect such an effect in appropriate nanostructures.
  • 21.01. Tatjana Wilk (MPQ)
Single-Atom Single-Photon Quantum Interface, T. Wilk, S. C. Webster, A. Kuhn, and G. Rempe, Science 317, 488 (2007).
  • 14.01. abstracts
  • 10.12. Ringberg week
  • 03.12. Lucas: Is the sequential generation of global unitary operations possible?, Lamata et al., arXiv:0711.3652v1 [quant-ph]
  • 26.11., 9:30h quantum breakfast
  • 19.11. abstracts
Christine: Probabilistic entanglement generation with atoms
Geza: Generation of single optical plasmons in metallic nanowires coupled to quantum dots, Akimov et al., Nature 450 402 (2007)
Intricate dynamics of quantum dot nuclear spins in low and high magnetic fields
Electron spins trapped in solid-state systems exhibit strong hyperfine interactions with a nuclear spin reservoir, which is normally fluctuating and randomly oriented. As this represents a fundamental decoherence mechanism for the electron spin [1], several theoretical scenarios to suppress this effect in optically active semiconductor quantum dots (QDs) have been proposed [2,3]. However, implementation of these proposals requires a deeper understanding of the properties of the mesoscopic QD nuclear spin ensemble and of the possibilities of manipulating the nuclear spins.
For that purpose, we use optical preparation and detection of the spin and energy of QD electrons to manipulate and measure the average nuclear spin polarization (NSP) in a single, self-assembled QD [4]. Our experiments show that the transfer of spin information between the electron and the nuclei is strongly dependant on the degree of the nuclear spin polarization itself. This feedback of nuclear spin polarization on the electrons in form of an effective magnetic field makes the coupled electron-nuclear spin system behave in a highly nonlinear way [5].
I will present experimental evidence for these nonlinearities and discuss recent time resolved studies of NSP which show that a QD electron can also be very efficient in destroying an established QD NSP [6]. Moreover, due to the nonlinear behavior of the coupled electron-nuclear spin system, this nuclear spin decay can have interesting non-exponential characteristics in the presence of external magnetic fields. I will discuss how a systematic study of the dynamics of NSP in external magnetic fields could give a more detailed picture of the mechanisms causing QD nuclear spin depolarization and what role nuclear quadrupolar interactions might play for the QD nuclear spin ensemble. Ultimately, further understanding of these subtle interactions could enable us to improve the decoherence time of the electron spin.
[1] A. V. Khaetskii et al., Phys. Rev. Lett. 88, 186802 (2002).
[2] A. Imamoglu et al., Phys. Rev. Lett. 91, 17402 (2003).
[3] G. Giedke et al., Phys. Rev.A 74, 32316 (2006).
[4] C.W. Lai et al., Phys. Rev. Lett. 96, 167403 (2006).
[5] P. Maletinsky et al., Phys. Rev. B 75, 35409 (2007).
[6] P. Maletinsky et al., Phys. Rev. Lett. 99, 056804 (2007).
Christine: Sudden Death of Entanglement Almeida et al., Science 316 579 (2007)
Geza: Efficient multi-qubit entanglement via a spin-bus, Friesen et al., PRL 98 230503 (2007)
  • 09.07. Martin Kroner (Center for NanoScience, Department für Physik, LMU)
Optically Detected Electron Spin Resonance of a Single Electron in a Self-Assembled Quantum Dot
The physical properties of a single electron spin, confined in a quantum dot (QD) are of major interest in semiconductor physics. In particular the spin degree of freedom of a single electron has often been proposed as a candidate for quantum bits (qubits), the information entities for quantum computers. To perform operations on spin qubits, magnetic resonance schemes have been recently successfully demonstrated in transport experiments [1].
Here we present an optical detection method to perform electron spin resonance experiments (ESR) on a single electron, confined in a self-assembled QD. The method is based on a high fidelity spin initialization scheme [2], which allows to optically align the spin of a resident electron in a QD with probability larger than 95%, at magnetic fields below 0.5T. Applying a microwave field resonant with the electron Zeeman splitting upsets the optical spin alignment scheme. A manifestation of this is the reappearance of the resonant exciton interband absorption. The electron spin resonance signal is here detected by monitoring the change in resonant exciton interband transition as a function of the microwave frequency. At a magnetic field of 0.5 T and a frequency of approximately 4 GHz, we observed extremely narrow electron spin resonances with a linewidth of down to 340 kHz (fig. 1).
  • 16.04. break for Gordon conference
  • 10.04. Christine
  • 02.04. DPG-Tagung reports (Heike)
  • 15.03., 13:30h Special Quantum Optics Seminar
Prof. F. Henneberger (Humboldt Universität zu Berlin): Nuclear-Electron Spin Dynamics in Semiconductor Quantum Dots
Akimov et al., Phys. Rev. Lett. 97, 056602 (2006)
  • 05.03. Abstracts
Henning: Friesen et al., quant-ph/0702228 Efficient multiqubit entanglement via a spin-bus
Geza: Amin et al., cond-mat/0609332 Thermally assisted adiabatic quantum computation
Geza Simon and Loss, Nuclear spin ferromagnetic phase transition in an interacting 2D electron gas cond-mat/0611292
Cosmo: Kleckner and Bouwmeester, Sub-kelvin optical cooling of a micromechanical resonator, Nature 444 75 (2006)
  • 7.11. Geza: sketch of proposals and implementations of QIP with NV centers in diamond
(Childress et al., Science 314 281 (2006), Jelezko et al., PRL 93 130501 (2004), Childress et al. PRL 96 070504 (2006))
  • 31.10. 15:00 Special Quantum Optics Seminar
Markus Müller (Universität Konstanz): Interaction-Induced Renormalization of Andreev Reflection
  • 24.10. Henning: Self-Polarization and Cooling of Spins in Quantum Dots cond-mat/0609409
  • 17.10. Abstracts
Inés: Simulating the Bose-Hubbard Hamiltonian with arrays of optical cavities quant-ph/0606159, quant-ph/0606097
Christine: Non-destructive interferometric characterization of an optical dipole trap, quant-ph/0610107
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