Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session H09: Quantum Optics and Wavelength Conversion |
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Chair: Elmer Guardado-Sanchez, Harvard University Room: 206 D |
Wednesday, June 7, 2023 8:00AM - 8:12AM |
H09.00001: Quantum Electrodynamics with Time-Varying Dielectrics Ashwith Varadaraj Prabhu, Kanu Sinha, Elizabeth A Goldschmidt Fundamental advances in photonics have enabled the development of exotic meta-materials, epsilon-near-zero materials, atomic mirrors and photonic crystals which can form dielectric media with time-varying optical properties. We develop a general formalism to describe quantum electrodynamic (QED) effects in the presence of such time-varying dielectrics, following the Huttner-Barnett model for canonical quantization of electromagnetic fields in dielectric media. Considering a microscopic model for the dielectric as a collection of matter fields interacting with the electromagnetic environment, we allow for the possibility of dynamically varying the dielectric susceptibility and develop constraints on the temporal dependence of the susceptibility. The analysis is then extended to develop a macroscopic QED formalism for time-varying dielectrics. Our results pave the way for investigating a wide range of QED phenomena in the vicinity of time-varying dielectrics. |
Wednesday, June 7, 2023 8:12AM - 8:24AM |
H09.00002: Phase locking and frequency entrainment in driven generalized quantum Rayleigh-van der Pol oscillators Aidan J Sudler, Jugal Talukdar, D. Blume Driven classical self-sustained oscillators have been studied extensively in the context of synchronization. This work considers the master equation for the driven generalized Rayleigh-van der Pol oscillator. A key feature of the class of master equations considered is that it includes dissipators with broken rotational symmetry. This implies that the Wigner distribution of the quantum mechanical limit cycle state in the absence of the drive is, in general, not rotationally symmetric. The impact of the symmetry-breaking dissipators on the long-time dynamics, including the emergence of quasi-stationary states, is investigated. To characterize the synchronization, phase locking and frequency entrainment are analyzed as functions of the drive strength and detuning, covering the deep quantum to near-classical regimes. |
Wednesday, June 7, 2023 8:24AM - 8:36AM |
H09.00003: Searching for Localization in Subradiant Atomic Arrays Nik O Gjonbalaj, Stefan Ostermann, Oriol Rubies-Bigorda, Susanne F Yelin Atomic arrays can exhibit collective light emission when the transition wavelength exceeds their lattice spacing. Subradiant states take advantage of this phenomenon to drastically reduce their overall decay rate, allowing for long-lived states in open systems strongly coupled to a bath. We build on previous work to investigate whether or not disorder can further decrease the decay rate of a partially excited atomic array. More specifically, we implement spatial disorder and frequency disorder of varying strengths in 1D, 2D, and 3D atomic arrays of various sizes, simulate the decay, and compare to simulations with zero disorder. We discuss the importance of the range of the light-mediated atom-atom interaction and also comment on the strengths and weaknesses of various computational methods when looking for localization in atomic arrays. Finding effective ways to enhance subradiance using disorder could help build platforms for quantum memory robust to strong interactions with their environment. |
Wednesday, June 7, 2023 8:36AM - 8:48AM |
H09.00004: Chirp asymmetry as an analogue of early universe leptogenesis Michael Crescimanno, Matthew Commons, Nicole Abend, Ian M Jones, Jonathan T George, Aaron W Weiser The effective conjugation symmetry that arises in the rotating wave frame is the analogue of the charge conjugation symmetry in field theory. Breaking this effective conjugation symmetry leads to asymmetries between up- and down- chirped excitation in quantum optical systems. We use semiclassical quantum optics theory to describe these processes and characterize the experimentally measured asymmetry in the optical response in chirped, two-color saturated absorption spectroscopy (SAS) in an atomic vapor cell. Doing so demonstrates a theoretical and phenomenological correspondence to the simplest model of leptogenesis, the process by which our universe purportedly went from equal amounts of matter and antimatter to its present matter excess. This understanding of the asymmetry arising from a broken discrete symmetry under chirp illuminates the underlying processes responsible for other multiphoton asymmetries previously noted in the literature. |
Wednesday, June 7, 2023 8:48AM - 9:00AM |
H09.00005: Intensity effects of light coupling to one or two atom arrays Francis J Robicheaux, Deepak Aditya Suresh Recent predictions[1,2] of perfect reflection of light from single layer atom arrays inspired many different theoretical and experimental investigations of this system. Most studies are in the weak laser limit where the harmonic approximation for the atom states holds well. We focus on how this system behaves as the intensity of the incident light is increased and the weak laser approximation progressively fails. Simulations are performed for both single arrays and a pair of parallel arrays in a geometry that leads to a resonant cavity for the light. We study how the reflected, transmitted, and incoherently scattered probabilities depend on detuning and intensity. For the cavity geometry, the weak laser approximation fails at very small intensities. Calculations are performed for both infinite arrays and finite size arrays. We also investigate the behavior of the photon statistics as embodied in g(2) functions. |
Wednesday, June 7, 2023 9:00AM - 9:12AM |
H09.00006: Wavelength Conversion of Single Photons from a Quantum Dot in Warm Cs Vapor Sai Sreesh Venuturumilli, Rubayet Al Maruf, Paul Andersion, Divya Bharadwaj, Katie McDonnell, Michael Li, Dan Dalacu, Philip Poole, Michael Reimer, Michal Bajcsy We report our progress on experimentally demonstrating conversion of single ~894 nm photons produced from a quantum dot to wavelengths suitable for long distance communication via optical fiber (~1469 nm) or via ground-to-satellite link (~794 nm) using warm caesium vapor. The quantum dot (QD) is grown inside a semiconductor nanowire and offers a bright source of single photons and entangled photon pairs. The QD emission is precisely tuned to near the Cs D1 line at ~894.6 nm by our recently developed gas deposition technique, in which nitrogen gas deposited on the nanowire surface shifts the QD emission wavelength. The conversion is realized via a four-wave-mixing process in vapor, where two classical pump fields interact with the input photons to convert them to the target wavelength. To achieve maximum conversion efficiency, we obtain parameters for the two pump fields, as well as for the detuning of the quantum dot photon, from our numerically optimized model that accounts for the hyperfine structure and Doppler broadening of the atoms. |
Wednesday, June 7, 2023 9:12AM - 9:24AM |
H09.00007: Broadly tunable and coherent microwave-to-optical conversion in a thermal atomic vapor Benjamin D Smith, Bahar Babaei, Andal Narayanan, Lindsay J LeBlanc Flexible frequency tunability is a desired feature for frequency conversion schemes. Here, we experimentally realize nonlinear sum-frequency generation (SFG) between input 6.8 GHz microwave and 384 THz (780 nm) optical fields, mediated by room temperature 87Rb atoms inside an enclosed microwave cavity. We demonstrate coherence in this microwave-to-optical conversion and show that the output optical frequency can be tuned across more than 500 MHz due to the Doppler broadening of the atomic sample. We characterize this system in terms of bandwidth, tunability, and efficiency. Additionally, using amplitude-modulated microwave fields, we demonstrate that multimode signals can be transduced to the generated optical light, paving the way for frequency bin encodings. Finally, we characterize the temporal characteristics of the conversion process and explore how the non-linearities of this configuration may lead to new opportunities for microwave-controlled signal manipulation. |
Wednesday, June 7, 2023 9:24AM - 9:36AM |
H09.00008: Microwave-to-optical conversion using room-temperature atoms Sebastian Borówka, Uliana Pylypenko, Mateusz Mazelanik, Michal Parniak Conversion between microwave and optical photons is a challenging task with many possible applications. The potential ranges from interconnects between quantum devices such as superconducting chips, to the detection of very weak signals via upconversion and photon counting. Such detection would be beneficial for radar science, radioastronomy, and telecommunications, and the requirements are more relaxed compared with fully quantum systems. We find that in this case, upconversion in a room-temperature ensemble of Rydberg atoms provides an impressive performance, beating typical microwave amplifiers and matching the performance of cryogenic electronics in terms of intrinsic noise. |
Wednesday, June 7, 2023 9:36AM - 9:48AM |
H09.00009: Toward quantum networking based on entanglement transfer between photons and atoms Lauren S Weiss, Jonathan Trisnadi, Mingjiamei Zhang, Evan P Yamaguchi, Callum L Welsh, Chang Li, Hannes Bernien, Cheng Chin Entanglement transfer is a crucial step in the realization of quantum networks. We propose to entangle atoms in separate labs by generating spectrally narrow pairs of entangled photons via cavity-enhanced spontaneous parametric downconversion and fiber-coupling them to interact with atoms in disparate experimental setups. In each lab, single-atom rotation and imaging will be employed to measure the atomic state and verify entanglement. We detail the current entangled photon setup, our scheme for atom entanglement, and progress on the cooling and site-resolved imaging in a novel experimental setup called the quantum matter synthesizer. |
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