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 U10: Cavity QED and Nanophotonics |
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Chair: Matthew Eiles, Max Planck Institute for the Physics of Complex Systems Room: 207 |
Thursday, June 8, 2023 2:00PM - 2:12PM |
U10.00001: Lightweight stable near-concentric cavity design Florentin Adam, Wen Xin Chiew, Adrian N Utama, Christian Kurtsiefer In order to engineer and achieve coherent interaction between atoms and photons, optical resonators are fundamental candidates. Governed by cavity quantum electrodynamics, cavity systems require to contain photons in a small mode volume to perform strong atom-light interaction. Conventionally, this small mode volume is achieved through the use of small high-finesse optical resonators. However, a different cavity configuration can also implement small mode volumes, namely large optical resonators operated in the near-concentric regime. Due to their configuration, near-concentric cavities provide a large optical access between the mirrors and only require low-finesse to operate. Nevertheless, a stable cavity length is necessary to perform interaction with a single atom. |
Thursday, June 8, 2023 2:12PM - 2:24PM |
U10.00002: Nanophotonic cavity cooling of cold atoms Sambit Banerjee, Chenwei Lv, Ming Zhu, Chen-Lung Hung Ultracold atoms strongly coupled to photonic fields in nanoscale waveguides and cavities have diverse applications in quantum networks, quantum nonlinear optics, and quantum simulations. For all these scenarios, the key challenge has always been efficiently cooling and trapping atoms in the evanescence field region of a nanophotonic structure. In this talk, we discuss how a cavity cooling mechanism can be used to capture a single atom in an optical microtrap near a nanophotonic cavity. In particular, a cavity-guided pump field can be used to induce position- and velocity-dependent friction force as well as momentum diffusion in all three dimensions. We conduct full 3D Monte Carlo simulations to demonstrate the efficiency and stability of our cooling and trapping scheme. Our analytical results corroborate numerical simulations without the weak-driving assumption in the parameter regime considered. Moreover, we discuss how our scheme can be implemented to current experimental platforms. |
Thursday, June 8, 2023 2:24PM - 2:36PM |
U10.00003: Multiphoton Quantum Rabi Oscillations in Waveguide QED Debsuvra Mukhopadhyay, Jung-Tsung Shen Cavity QED and chip-scale nanophotonics constitute the keystones to the future of quantum information processing and communication. One of the foremost processes underpinning quantum photonic technologies is the phenomenon of Rabi oscillations wherein a qubit is irradiated by a coherent light source. In contrast to this conventional setting, in this talk, we expound on the more general case where the optical excitation is the multiphoton Fock state which is a fundamental building block for the photonic Hilbert space. By employing the real-space approach in waveguide QED, we analytically explore the scattering dynamics of the photonic Fock state as it interfaces with a two-level emitter. Our analysis extends the results on single-mode Rabi oscillations pertinent to cavity QED, to the paradigmatic, multimode, waveguide-QED models where flying photons are the essential information carriers. The temporal evolution of the qubit excitation in our configuration shows canonical correspondences as well as some critical differences with the single-mode, cavity-QED result. Specifically, in the regime of large detunings, the qubit exhibits Rabi-like oscillatory dynamics akin to the single-mode case. Contrastingly, in the opposite regime of very low detunings, spontaneous emission from the qubit gains prominence and can quickly stifle any oscillatory signatures. Our findings should be relevant to future Fock-state-based quantum computing and associated waveguide-integrated photonic technologies. |
Thursday, June 8, 2023 2:36PM - 2:48PM |
U10.00004: Degenerate Multimode Cavities for Topological Quantum Optics with Rydberg Polaritons Lukas Palm, Matthew Jaffe, Claire Baum, Jon Simon Realizing fractional Quantum Hall states in quantum simulation experiments is a long-standing goal on the way to understanding and harnessing topological states of matter. Initial progress has been demonstrated with our realization of a two-photon Laughlin state [1] and recently the demonstration of a two-atom Laughlin state in an optical lattice [2], stimulating the quest to prepare bigger systems where true many-body properties like anyonic quasi-particles become accessible. Our hybrid platform uses cavity Rydberg polaritons, quasiparticles of an optical cavity photon hybridized with an interacting atomic Rydberg excitation, to create interactions and artificial gauge fields for light. We will present our new, aspheric lens-based degenerate multimode cavity that will allow approaching mesoscopic system sizes, and first experimental results using this platform on the way to larger Quantum Hall states. |
Thursday, June 8, 2023 2:48PM - 3:00PM |
U10.00005: Opening a quantum communication channel in a chiral lattice for photons Margaret G Panetta, Andrei Vrajitoarea, Gabrielle Roberts, Brendan Saxberg, Clai Owens, Srivatsan Chakram, Ruichao Ma, David Schuster, Jonathan Simon Superconducting quantum bits and microwave cavity resonators provide a platform for constructing synthetic quantum materials which leverages the strong coupling between superconducting qubits and cavities and offers the option to introduce topology through physical modifications to an engineered system. We have previously [1] realized a quarter-flux Hoftsadter lattice for microwave photons from a 2D array of superconducting cavities and have coupled this topological photonic metamaterial to a single superconducting transmon qubit, exploring cavity quantum electrodynamics in this chiral system [2]. Here we couple two nonlinearities to this photonic lattice and share progress towards demonstrating qubit-qubit communication via a chiral lattice edge channel. Addition of more nonlinearities supplies access to photon-photon interactions and develops an avenue towards combining topology and many-body physics in a synthetic material. |
Thursday, June 8, 2023 3:00PM - 3:12PM |
U10.00006: Atom-photon entanglement transfer using a 3-D multimode cavity with a single uniformly moving mirror Aneesh Ramaswamy, Svetlana A Malinovskaya A scheme is developed to generate efficient coherent transfer from the Rydberg atomic W state to the photonic W state, 1 /√3 (|rrg〉+|rgr〉+|grr〉)⊗|000〉→1 /√3(|ggg〉⊗(|110〉+|101〉+|011〉), using a single multimode cavity. Each mode is selected to be initially resonant with a Rydberg to ground state transition for a single 3 atom configuration and is linear chirped to gradually transfer population from the Rydberg to ground states over a 1 ns interval. A theoretical model of the 3-dimensional cubical cavity with a single slow uniformly moving mirror is used as a template to derive the spatial modes and interaction Hamiltonian for the chirped cavity modes. The problem of realizing the |ggg〉⊗|011〉 component has been solved by chirping each of the 3 cavity modes such that mode 2 will be resonant with the lowest energy transition at a time T1 when half of the |rrg〉,|grr〉 initial populations are depleted through interaction with mode 3. High fidelity atom-photon transfers require optimal selection of cavity parameters involving the mode numbers, chirp rates, time delays, and mode coupling rates in order to control inter-mode coupling processes and suppress repopulation of the Rydberg state. The determination of these parameters is a quantum control problem; we solved it using parametric optimization for the total state by means of the Laplace transformed integro-differential equation for the wavefunction. |
Thursday, June 8, 2023 3:12PM - 3:24PM |
U10.00007: Cavity Induced Polaritons in the Collective Regime Vasil Rokaj, Simeon I Mistakidis, Hossein R Sadeghpour Cavity quantum electrodynamics provides an ideal platform to engineer and control light-matter interactions with polariton quasiparticles. In this work, we investigate collective phenomena in a system of many particles in a harmonic trap coupled to a homogeneous quantum cavity field. The system couples collectively to the cavity field, through its center of mass, and collective polariton states emerge. The cavity field mediates pairwise long-range interactions and enhances the effective mass of the particles. This leads to an enhancement of localization in the matter ground state density, which features a maximum when light and matter are on resonance, and demonstrates a Dicke-like, collective behavior with the particle number. The light-matter interaction also modifies the photonic properties of the polariton system, with the ground state is populated with bunched photons. In addition, it is shown that the diamagnetic term is necessary for the stability of the system, as otherwise the superradiant ground state instability occurs. We demonstrate that coherent transfer of polaritonic population is possbile with an external magnetic field and by monitoring the Landau-Zener transition probability. |
Thursday, June 8, 2023 3:24PM - 3:36PM |
U10.00008: Collective cavity Rayleigh scattering of an atomic array Zhenjie Yan, Jacquelyn Ho, Yue-Hui Lu, Dan M Stamper-Kurn Collective coupling between an optical cavity and multiple atoms facilitates enhanced light-matter interfacing, long-range interactions, and entanglement generation among all coupled atoms. Here we demonstrate such cooperative interactions through cavity Rayleigh scattering from an atom array. Each atom in the array has a thermal spreading much smaller than the cavity wavelength. We are able to move the position of atoms continuously, thus controlling the phase and amplitude of the atom-cavity interaction. For a pair of atoms, we observe constructive and destructive interference at spacings of integer and half-integer wavelengths, respectively. For an atom array with N atoms located at cavity antinodes of the same phase, we observe a near N2 scaling of superradiant scattering rate, as well as spectral shifts and broadenings due to cavity backaction. |
Thursday, June 8, 2023 3:36PM - 3:48PM |
U10.00009: Transporting and coupling single atoms to a nanophotonic whispering-gallery-mode resonator Xinchao Zhou, Tzu-Han Chang, Hikaru Tamura, Chen-Lung Hung Interfacing cold atoms with nanophotonic waveguides and resonators promises stronger atom-light interactions and may leads to new applications for quantum optics. In this talk, we discuss successful realization for large cooperative coupling of single atoms to a nanophotonic whispering-gallery-mode resonator using two different atom trapping and delivery methods. The first one is an optical guiding technique that makes use of diffracted light from a nanophotonic waveguide to direct cold atoms to the evanescent region of the resonator. The second one is an optical conveyor-belt consisting of a moving optical lattice for controlled delivery of trapped atoms. Our demonstration may enable new applications with scalable light-matter interface based on cold atoms coupled to nanophotonic circuits. |
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