Bulletin of the American Physical Society
51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 65, Number 4
Monday–Friday, June 1–5, 2020; Portland, Oregon
Session M03: Nonlinear OpticsLive
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Chair: Michael Raymer, University of Oregon Room: D135-136 |
Thursday, June 4, 2020 8:00AM - 8:12AM Live |
M03.00001: Repulsive photon-photon interactions mediated by Rydberg atoms. Sergio Cantu, Aditya Venkatramani, Wenchao Xu, Leo Zhou, Brana Jelenkovic, Mikhail Lukin, Vladan Vuletic The ability to control strongly interacting light quanta (photons) is of central importance in quantum science and engineering. Here, we demonstrate a method for coherent control of strongly interacting photons, extending quantum nonlinear optics into the domain of repulsive photons. This is achieved by coherently coupling photons using electromagnetically induced transparencies (EIT) to several atomic states, including strongly interacting Rydberg levels in a cold Rubidium gas. Using this approach we demonstrate both repulsive and attractive interactions between individual photons and characterize them by the measured two- and three-photon correlation functions. For the repulsive case, we demonstrate signatures of interference and self ordering from three-photon measurements. These observations open a route to study strongly interacting dissipative systems and quantum matter composed of light such as a crystal of individual photons. [Preview Abstract] |
Thursday, June 4, 2020 8:12AM - 8:24AM Live |
M03.00002: Strongly Interacting Optical and mm-Wave Photons using Rydberg Atoms Mark Stone, Aziza Suleymanzade, Aishwarya Kumar, Lavanya Taneja, Jasmine Kalia, David Schuster, Jonathan Simon Strong interactions between optical and mm-wave photons hold great promise in developing new quantum technologies. Our experiment creates this dual-frequency interaction by hybridizing a cavity optical photon with an atomic Rydberg excitation, which is also strongly coupled to a superconducting 100 GHz cavity. We describe our results, using this high-quality factor mm-wave cavity and the large Rydberg dipole moment to generate nonlinearity on the optical transition. We discuss possible applications of the hybrid system, including optical to mm-wave frequency transduction and generation of atomic spin-squeezed states using the high single-atom cooperativity of the mm-wave transition. [Preview Abstract] |
Thursday, June 4, 2020 8:24AM - 8:36AM Live |
M03.00003: Interfacing single millimeter wave and optical photons using Rydberg atoms as mediators. Aziza Suleymanzade, Mark Stone, Aishwarya Kumar, Lavanya Taneja, Jasmine Kalia, David Schuster, Jonathan Simon In this talk, I introduce our hybrid quantum system for entangling and inter-converting single millimeter waves (mm-waves) and optical photons. In our apparatus, a cloud of cold Rubidium 85 atoms is lowered into a hybrid optical Fabry-Perot and 3D superconducting mm-wave cavity, where it simultaneously interacts with both optical and mm-wave photons via Electromagnetically Induced Transparency (EIT). One of the strengths of our approach is a high cooperativity of 22000 between a single mm-wave photon and a Rydberg atom, enabling a strong nonlinearity. Aside from providing the experimental details of our setup, I will motivate our use of mm-wave photons both as a promising interlink band for hybrid cavity and circuit QED systems, and as a stand alone platform for quantum devices at high temperatures. [Preview Abstract] |
Thursday, June 4, 2020 8:36AM - 8:48AM Live |
M03.00004: Universal scattering in photonic impurity problems: dispersion, dissipation and quantized phases Yidan Wang, Michael Gullans, Alexey Gorshkov Many synthetic quantum systems allow particles to have unusual dispersion relations, besides linear or quadratic. To understand the impact of different dispersion relations on the behavior of scattering, we study particles propagating in a 1D channel scattered by quantum impurities. We show that the scattering matrix approaches different universal limits when the group velocity vanishes at different rates. Also, the existence of generic bound states is decided by an interplay between dissipation of the impurities and dispersion relation. We present how the scattering phase is related to the number of bound states for general dispersion relations, as a generalization of Levinson's theorem beyond quadratic dispersion relation. [Preview Abstract] |
Thursday, June 4, 2020 8:48AM - 9:00AM Live |
M03.00005: Tailoring Atom-Light Coupling with Atomic Lattices Taylor L. Patti, Dominik S. Wild, Ephraim Shahmoon, Mikhail D. Lukin, Susanne F. Yelin We examine a mechanism by which the steady-state excitation likelihood of a single target atom in a weak driving field can be enhanced by many orders of magnitude and/or serve as a long-term quantum memory via interaction with a proximal atomic square lattice. Additionally, we consider an alternate configuration of this mechanism which produces many-body photon bound states on the lattice and produces strong near-field effects. The addition of a second target atom to this system yields coherent, array-mediated coupling between the two emitters. These phenomena are highly sensitive to relative atomic linewidth, polarization, and detuning between the ”impurity” atom of interest and those of the array, and can be conceptualized as impurity interaction with array band structure and collective decay modes. In the case of an infinite lattice, we introduce these interactions in terms of the impurity’s self-induced energy and Rabi drive, which stem from its interaction with lattice normal modes. Moreover, we develop an analytic toy model which elucidates both the intuition of these states as well as the relative experimental flexibility in lattice size. [Preview Abstract] |
Thursday, June 4, 2020 9:00AM - 9:12AM Live |
M03.00006: Oscillating bound states for a giant atom Anton Frisk Kockum, Lingzhen Guo, Florian Marquardt, Göran Johansson We investigate the relaxation dynamics of a single artificial atom interacting, via multiple coupling points, with a continuum of bosonic modes (photons or phonons) in a one-dimensional waveguide. In the non-Markovian regime, where the travelling time of a photon or phonon between the coupling points is sufficiently large compared to the inverse of the bare relaxation rate of the atom, we find that a boson can be trapped and form a stable bound state. More interestingly, if the number of coupling points is more than two, the bound state can oscillate persistently by exchanging energy with the atom despite the presence of the dissipative environment. We propose several realistic experimental schemes to generate such oscillating bound states. [Preview Abstract] |
Thursday, June 4, 2020 9:12AM - 9:24AM Live |
M03.00007: Non-Hermitian Optical Four-Wave Mixing in Cold Atoms Yue Jiang, Yefeng Mei, Ying Zuo, Yanhua Zhai, Jensen Li, Jianming Wen, Shengwang Du We report demonstration of non-Hermitian optical four-wave mixing (FWM) in cold atoms. Particularly we show that anti-Parity-Time (anti-PT) symmetry is inherent in the forward Four-Wave Mixing (FFWM) process without linear gain and loss. Different from the traditional PT/anti-PT experiments that rely on the interplay of gain and loss to exploit non-Hermitian dynamics, in this experiment, we obtain the anti-PT Hamiltonian by making use of phase mismatching and nonlinear photon-atom coupling. By tuning the nonlinear coupling strength, we observe the dynamics of anti-PT phase transition. The work was supported by the Hong Kong Research Grants Council (Project No. 16308118 and No. C6005-17G). [Preview Abstract] |
Thursday, June 4, 2020 9:24AM - 9:36AM On Demand |
M03.00008: Conversion Between Telecom and Atomic Photons by Four-Wave Mixing in Warm Rb. Jonathan Kwolek, Adam Black, Mark Bashkansky, Michal Piotrowicz Conversion of atomic-wavelength photons to and from telecom wavelengths is needed for quantum networks and quantum communication that require quantum states to be transferred over large distances. Previously, a conversion between atomic wavelengths and 1.3 $\mu $m photons has been demonstrated in an ultra-dense cold atomic ensemble. Here we present a much simpler method of conversion from 1530 nm to 795 nm employing a four-wave mixing (FWM) scheme in a warm vapor cell. Atoms in the warm Rb cell are initially optically pumped to F$=$2, m$_{\mathrm{F}}=$2 state to create a dense optical sample for the FWM process by judicious choice of pump and signal polarizations as well as atomic states, detunings and pulse durations. 1530 nm photons are converted to 795 nm in the FWM process with pump beams at 1475 nm and 780 nm, while weak signal beam is at 1530 nm. Converted 795 nm photons are detected by single photon detector. We observe that for longer FWM pulses the conversion efficiency saturates at high Rabi frequencies of pump lasers. By time gating the measurement to the initial 25 ns of the pump pulse, and detuning the pump lasers the conversion reaches 6{\%}. The limiting factors for the conversion are the powers of the pump lasers and population redistribution in the magnetic sublevels of the ground state. [Preview Abstract] |
Thursday, June 4, 2020 9:36AM - 9:48AM Not Participating |
M03.00009: Fast and Slow Light in a Phase-Sensitive Optical Amplifier Nick Brewer, Tian Li, Kevin Jones, Paul Lett Phase-sensitive optical amplifiers (PSAs) have the ability to noiselessly amplify and deamplify signals and thus have great potential in both classical and quantum communication. Here we construct a PSA using a double-lambda four-wave mixing scheme on the D1 line of rubidium in a warm vapor cell. An intensity-modulated beam is used as an input to the optical amplifier and the gain and delay of the output is measured. It is found that when the sidebands of the signal are unbalanced the signal develops an apparent advance or delay, similar to fast- and slow-light phenomena. The difference, however, is that the advance or delay depends on the relative phase of all three beams contributing to the four-wave mixing process rather than the optical frequency. It was found that the sidebands of the signal can be systematically imbalanced via misalignment to an optical fiber after the acousto-optic modulator used to modulate the beam. The advance and delay for several different sideband imbalances was measured and found to be consistent with a model of an ideal PSA. [Preview Abstract] |
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