Bulletin of the American Physical Society
49th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
Volume 63, Number 5
Monday–Friday, May 28–June 1 2018; Ft. Lauderdale, Florida
Session Q09: Quantum Optics I |
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Chair: F. Elohim Becerra, University of New Mexico Room: Grand H |
Thursday, May 31, 2018 8:00AM - 8:12AM |
Q09.00001: Steady-State Superradiance in a Beam Laser Configuration Haonan Liu, John Cooper, Athreya Shankar, Murray Holland Previous studies of steady-state superradiance have involved atoms with ultranarrow linewidth pumped incoherently in the so-called bad-cavity regime where the cavity decay rate far exceeds that of the atoms. The light emitted in the superradiance regime promises to be coherent with a linewidth that for realistic experimental parameters is predicted to be as narrow as a few millihertz. However, in reality it can be difficult to realize the incoherent pumping process in experiments without suffering the adverse effects of radiative heating. Here we propose a straightforward experimental configuration of the superradiance laser, \textit{i.e.}, the beam laser, which is ``pumped'' by introducing a continuous beam of excited atoms into a lossy cavity. Our numerical simulations give strong evidence for the development of macroscopic spin-spin correlations and thus the ability to enter the parameter space of steady-state superradiance. With the atom shot noise included, we show that in the limit of large atom number, it is still possible to recover similar results to those previously observed for the superradiant laser. The influence of Doppler effects and the new methods necessary due to the breakdown of permutation symmetry are discussed. [Preview Abstract] |
Thursday, May 31, 2018 8:12AM - 8:24AM |
Q09.00002: Tunable-Range, Photon-Mediated Atomic Interactions in Multimode Cavity QED Yudan Guo, Varun Vaidya, Ronen Kroeze, Kyle Ballantine, Alicia Kollar, Jonathan Keeling, Benjamin Lev Optical cavity QED provides a platform with which to explore quantum many-body physics in drivendissipative systems. Single-mode cavities provide strong, infinite-range photon-mediated interactions among intracavity atoms. However, these global all-to-all couplings are limiting from the perspective of exploring quantum many-body physics beyond the mean-field approximation. The present work demonstrates that local couplings can be created using multimode cavity QED. This is established through measurements of the threshold of a superradiant, self-organization phase transition versus atomic position. Specifically, we experimentally show that the interference of near-degenerate cavity modes leads to both a strong and tunable-range interaction between Bose-Einstein condensates (BECs) trapped within the cavity. We exploit the symmetry of a confocal cavity to measure the interaction between real BECs and their virtual images without unwanted contributions arising from the merger of real BECs. Atom-atom coupling may be tuned from short range to long range. This capability paves the way toward future explorations of exotic, strongly correlated systems such as quantum liquid crystals and driven-dissipative spin glasses. [Preview Abstract] |
Thursday, May 31, 2018 8:24AM - 8:36AM |
Q09.00003: Cavity-mediated collective spin-exchange interactions on a millihertz linewidth optical transition Julia Cline, Matthew Norcia, Robert Lewis-Swan, Bihui Zhu, Ana Rey, James Thompson A key challenge in using laser cooled atoms for metrology or quantum simulation is understanding and controlling coherent interactions between the atoms. In this talk, we report the observation of spin-exchange interactions mediated by the emission and reabsorption of photons inside an optical cavity [Norcia \textit{et. al.} arXiv:1711.03673]. The interactions are tunable and infinite range. The effective spin degree of freedom is encoded in the clock states of $^{87}$Sr with radiative decay lifetime of 150 seconds. We observe one-axis twisting dynamics, the emergence of a many-body energy gap, and signatures of gap protection of the optical coherence against dephasing. The spin exchange interactions in our system are of particular interest since they occur in the ultra-narrow optical clock transition which contains up to ten different nuclear spin levels. These features may enable future applications for entanglement-enhanced metrology and for explorations of rich quantum many-body dynamics in a high-spin system. [Preview Abstract] |
Thursday, May 31, 2018 8:36AM - 8:48AM |
Q09.00004: Atom-Ring Cavity System for Multimode Quantum Technology Kevin Cox, David Meyer, Fredrik Fatemi, Paul Kunz Entanglement is the most ``quantum'' part of quantum mechanics, and the primary resource for quantum technologies with no classical analog. But before realizing the full promise of entanglement, improved and simplified devices for distributing entanglement must be invented. I will present new results for generating both remote and internal entanglement using rubidium atoms coupled to a parabolic ring cavity. We achieve strong coupling, with collective cooperativity C\textgreater 20, even with a simple and inexpensive ex-vacuo cavity, by using parabolic mirrors in an asymmetric geometry. Angular multiplexing allows creation of multiple distinct excitations in a single ensemble, opening paths toward multi-mode cavity QED, multi-qubit quantum network nodes, and high speed multiplexed quantum repeating. [Preview Abstract] |
Thursday, May 31, 2018 8:48AM - 9:00AM |
Q09.00005: Unconventional criticality in the driven Jaynes-Cummings model Jonathan Curtis, Jeremy Young, Howard Carmichael, Mohammad Maghrebi, Alexey Gorshkov, Michael Foss-Feig We study the single-atom Jaynes-Cummings model in the presence of cavity damping and coherent cavity drive. The undamped version of this model is known to exhibit an eigenstate transition, closely related to “spontaneous dressed-state polarization”, when the cavity driving strength exceeds the atom-cavity coupling. We investigate the consequence of this transition for the steady state at small cavity damping rates. Numerical and analytical evidence suggests the existence of a critical exponent (the so-called photon flux exponent) that is intermediate to the case of either a quantum or a thermal phase transition with respect to the underlying Hamiltonian. We contrast this finding to the well-studied (large-N) limit of many atoms, showing new evidence that the critical behavior for a single atom is of a fundamentally different nature. [Preview Abstract] |
Thursday, May 31, 2018 9:00AM - 9:12AM |
Q09.00006: Continuous motional sensing with highly dispersive medium Chang Huang, Pei-Chen Kuan, Shau-Yu Lan Current state-of-the-art atoms-based motional sensors rely on measuring the first-order Doppler shift of the atomic transition of single-particles. By using Doppler-sensitive detection methods, the population of atomic states and, therefore, the velocity of atoms can be measured precisely. On the contrary, here, we demonstrate a novel method of measuring the center-of-mass motion of an atomic ensemble using the collective interference of light passing through the ensemble under the condition of electromagnetically-induced-transparency (EIT). With the large enhancement of the dispersion in the EIT medium, we realize an atom-based velocimeter that has a sensitivity two orders of magnitude higher than the velocity width of the atomic medium used. This method has the advantages of high data rate and convenient detection of the interference phase of light over the conventional method of detecting the florescence of atoms and could lead to a new design of compact atoms-based motional sensors. [Preview Abstract] |
Thursday, May 31, 2018 9:12AM - 9:24AM |
Q09.00007: EIT Amplitude Noise Spectroscopy: Experimental Results Andrew Funk, Emma Hunt, Benjamin Whitenack, Michael Crescimanno We present~the results of~recent experimental tests of the hypothesis that the~electromagnetically induced transparency (EIT)~noise spectra in a Rb vapor illuminated by a free-running laser diode can be described in terms of a stochastic process~of~a pair of light field amplitudes.~Measured~EIT noise correlations~in~varied~post-cell polarization bases~are~understood in terms of a simple atomic quantum optical model. Amplitude noise correlators appear to be of utility for simplifying technology applications such as vector magnetometry with~a~warm atomic vapor.~ [Preview Abstract] |
Thursday, May 31, 2018 9:24AM - 9:36AM |
Q09.00008: Doubly-resonant electromagnetically induced transparency in a Fabry-Perot cavity Xin-Xin Hu, Chang-Ling Zhao, Zhu-Bo Wang, Yan-Lei Zhang, Xu-Bo Zou, Chun-Hua Dong, Guang-Can Guo, Chang-Ling Zou The optical resonator can enhance the light-matter interactions. We present an experimental study on the cavity-atom ensemble system, and realized the doubly-resonant enhanced electromagnetically induced transparency where both the probe and control lasers are on-resonance with the cavity. We demonstrate two approaches to realize the doubly-resonant condition, by controlling the temperature of the atom vapor cell, or by precisely tuning the cavity length. In such a system, the control power can be reduced due to the cavity enhancement, and we show all-optical switching with reduced control laser power compared to previous studies. Such doubly-resonant system can be used for various applications, such as optical signal storage and microwave-to-optical frequency conversion. [Preview Abstract] |
Thursday, May 31, 2018 9:36AM - 9:48AM |
Q09.00009: Trapped atom array along a microring resonator May Kim, Tzu-Han Chang, Brian Fields, Chen-Lung Hung We report on the design and experimental progress toward realizing a novel hybrid system, in which ultracold atoms are trapped in extremely close proximity to the surface of a microring resonator, allowing the guided mode photons to mediate strong and long-range atom-atom interactions. The development of high quality factor microring resonators on an optical chip capable of trapping atoms 100 nm above the surface will be discussed. Our current design allows us to achieve high cooperativity, or strong atom-light interaction. We will also present our schemes to control the position and the movement of the atoms using optical tweezer traps and probe the resulting quantum states through fluorescence imaging and single photon counting. Finally, we discuss possible long-range spin models that can be engineered using our platform, including quantum magnetism extending far beyond nearest neighbor interactions. [Preview Abstract] |
Thursday, May 31, 2018 9:48AM - 10:00AM |
Q09.00010: Single-photon bound states for propagating photons interacting with many atoms Yidan Wang, Michael Gullans, Darrick Chang, Alexey Gorshkov We illustrate the existence of single-excitation bound states for propagating photons interacting with $N$ two-level atoms. These bound states can be calculated from a spin Hamiltonian and their existence relies on the dissipation in the system. We find that the appearance of these bound states is in a one-to-one correspondence with zeros in the single-photon transmission and infinite bunching in the second-order photon-photon correlation functions. We also formulate a dissipative version of Levinson's theorem for this system by looking at the relation between the number of bound states and the winding number of the transmission phases. [Preview Abstract] |
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