Bulletin of the American Physical Society
43rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 57, Number 5
Monday–Friday, June 4–8, 2012; Orange County, California
Session M5: Atoms and Cavities |
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Chair: Murray Holland, University of Colorado at Boulder, JILA Room: Garden 3 |
Thursday, June 7, 2012 8:00AM - 8:12AM |
M5.00001: Generation of mesoscopic entangled states in a cavity coupled to an atomic ensemble Gor Nikoghosyan, Michael Hartmann, Martin Plenio The creation of mesoscopic entangled states is one of the fundamentalchallenges in quantum optics since they are very useful as resources for optical quantum information, quantum metrology, and super-precision lithography. In the present work (arXiv:1111.6047v1) we propose a novel system for the efficient production of optical NOON states based on the resonant interaction of a pair of quantized cavity modes with an ensemble of atoms. We show that in the strong-coupling regime the adiabatic evolution of the system tends to a limiting state that describes mesoscopic entanglement between photons and atoms which can easily be converted to a purely photonic or atomic NOON state. We also demonstrate the remarkable property that the efficiency of our scheme increases exponentially well with the cavity cooperativity factor, which gives efficient access to high number NOON states. The experimental feasibility of the scheme is discussed and its efficiency is demonstrated numerically. [Preview Abstract] |
Thursday, June 7, 2012 8:12AM - 8:24AM |
M5.00002: Atom-cavity system as a passive photon adder Julio Gea-Banacloche A single three-level atom, in the $\Lambda$ configuration, in an optical microcavity has been shown to have the potential to provide a totally passive photon-photon quantum logical gate [Koshino et al., Phys. Rev. A {\bf 82}, 010301(R) (2010)]. Recently, the same system has also been shown to work as a ``photon turnstile,'' or photon subtracter, which could remove a single photon from an incident N-photon pulse by changing its polarization to an orthogonal state [Rosenblum et al., Phys. Rev. A {\bf 84}, 033854 (2011)]. Here the possible performance of this system as a photon adder or subtracter will be analyzed, for different types of initial states, paying special attention to spectral entanglement effects and pulse reshaping. [Preview Abstract] |
Thursday, June 7, 2012 8:24AM - 8:36AM |
M5.00003: Photon blockade with a four-level atom coupled to a microcavity Michal Bajcsy, Arka Majumdar, Jelena Vu\v{c}kovi\'{c} We study the photon blockade phenomenon in a cavity containing a single four-level atom, starting with an idealized spacing of the energy levels in such atom. We show that while photon blockade in a cavity containing a two-level atom requires strong coupling between the atom and the cavity, the blockade becomes observable even in the absence of strong coupling when a four-level atom is used. The four-level atom outperforms the two-level atom also in the strongly coupled regime, as well as in the case when the spacing of the energy levels in the four-level atom becomes non-ideal. Finally, we show that with the mode volume and quality factors currently available in semiconductor optical microcavities, photon blockade should be achievable with alkali atoms coupled to such cavities. [Preview Abstract] |
Thursday, June 7, 2012 8:36AM - 8:48AM |
M5.00004: Collective state signatures in quantum correlations of Cavity QED Pablo Barberis-Blostein, Howard Carmichael, Luis Orozco The correlation function of spontaneous emission from of a continuously driven atomic ensemble inside a two-mode optical cavity (vertical and horizontal polarizations) exhibits a single atom contribution when one and the same atom executes Raman transitions to scatter two orthogonally polarized photons in sequence. This single-atom contribution can show photon anti-bunching, the widely understood non-classical signature of single-atom emission. If, on the other hand, there is more than one atom present at the moment the first photon is detected, the atomic ensemble must collapse to a collective state, since there is no way to know which atom emitted the photon. The collective state makes a new contribution to the correlation function and can generate collective photon anti-bunching (interference between anti-bunched probability amplitudes for a second photon emission). We discuss how to detect this collective state through measuring correlation functions and the decoherence mechanisms that transform the collective atomic state into a separable state. [Preview Abstract] |
Thursday, June 7, 2012 8:48AM - 9:00AM |
M5.00005: Deterministic and on-demand solid-state generation of photon Fock states Keyu Xia, Jason Twamley, Gavin Brennen, Demosthenes Ellinas Pure highly non-classical photon states are an essential component for quantum technologies such as quantum communication and cryptography, quantum enhanced metrology and quantum computing. To generate such pure states of light researchers have developed methods involving trapped ions, trapped atoms, quantum dots, cavity-QED, four-wave mixing and parametric down conversion but almost all of these methods are probabilistic/heralded. We present a method to deterministically and on-demand, generate pure photon Fock states of light with high photon occupation via a quantum walk like protocol in a solid-state cavity-QED setup using a high-Q toroidal cavity coupled to a single nitrogen-vacancy defect in a nanodiamond. Through a sequence of microwave, magnetic field and laser pulses we show that starting from the vacuum this system can produce high quality bright photon Fock states on demand and quantify how robust our protocol is to timing errors. [Preview Abstract] |
Thursday, June 7, 2012 9:00AM - 9:12AM |
M5.00006: Control of Photon Fock States in an Optical Cavity Byron Lowry, Bereket Berhane, Sergey Drakunov The ability to control quantum mechanical states is an essential requirement for many experiments in fundamental quantum mechanics and applications in quantum information system In this paper we derive the equation governing the dynamics of a single, two state, non-spontaneously emitting atom in a lossless cavity interacting with a single mode. Two different control methods are discussed and the controllability of the system is investigated for each method. The first method involves varying the coupling constant on the electric fieldeld-atom interaction. The second involves pumping or bleeding the system using atoms in the excited and grounds states respectively. A feasibility argument was made for the controllability of the system under those conditions. The dynamics of the system are then shown through arbitrary change of the control variables. [Preview Abstract] |
Thursday, June 7, 2012 9:12AM - 9:24AM |
M5.00007: ABSTRACT WITHDRAWN |
Thursday, June 7, 2012 9:24AM - 9:36AM |
M5.00008: Dissipative Preparation of Squeezing of a Collective Atomic Spin in a Cavity Johannes Otterbach, Emanuele Dalla Torre, Vladan Vuletic, Mikhail Lukin Spin squeezed states have attracted substantial interest over the last decades from fundamental and application points of view to study many-body entanglement and improve high-precision spectroscopy. One limiting factor for squeezing is the coupling to the environment which usually has detrimental effects on the generation and entanglement fidelity of these states. Here we present a scheme for the deterministic generation of spin squeezed states in coherently driven atomic ensemble of effective spin-1/2 particles collectively interacting with a strongly decaying cavity mode, thus turning dissipation into a resource for entanglement. We show that there exists a dark-state of the cavity dissipation exhibiting squeezing bounded only by the Heisenberg limit and calculate the timescale to reach this state. Upon taking spontaneous atomic scattering into account we determine the general scaling of the squeezing as a function of the collective atom-photon coupling and the cavity and atomic decay rates observing an improvement compared to the preparation schemes based on unitary time evolution. [Preview Abstract] |
Thursday, June 7, 2012 9:36AM - 9:48AM |
M5.00009: A Superradiant Raman Laser with $<$ 1 Intracavity Photons Justin Bohnet, Zilong Chen, Joshua Weiner, Dominic Meiser, Murray Holland, James Thompson We have demonstrated a cold-atom Raman laser operating deep in the bad-cavity (or superradiant) regime, where the atomic linewidth is much narrower than the cavity linewidth. The collective light-atom excitation is stored predominately in the atoms, with intracavity photon number as low as $0.2$ photons. The low intracavity photon number isolates the collective atomic dipole from the environment -- a possible future method for overcoming thermal fluctuations of cavity mirrors that presently limit the stability of state-of-the-art lasers. This laser linewidth is measured to be $>10^4$ below the Schawlow-Townes linewidth that normally applies to good-cavity optical lasers, as well as below single particle linewidths. Our system confirms key predictions that may enable the creation of superradiant lasers using highly forbidden atomic transitions that would have earth-sun coherence lengths, might improve optical atomic clocks by orders of magnitudes, and would contribute to searches for new physics beyond the standard model. [Preview Abstract] |
Thursday, June 7, 2012 9:48AM - 10:00AM |
M5.00010: Superradiant emission from a cascade atomic ensemble by positive-P phase space method simulation Hsiang-Hua Jen We numerically simulate the superradiant emission properties from an atomic ensemble with cascade level configuration. The correlated spontaneous emissions (signal then idler fields) are initiated by quantum fluctuations of the ensemble. We apply the positive-P phase space method to investigate the dynamics of the atoms and counter-propagating emissions in the four-wave mixing condition. The light field intensities are calculated, and the signal-idler correlation function is studied for different optical depths of the atomic ensemble. Shorter correlation time scale for a denser atomic ensemble implies a broader spectral window required to store or retrieve the idler pulse. [Preview Abstract] |
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