Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session M10: Quantum MemoriesLive
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Chair: Zheshen Zhang, University of Arizona |
Wednesday, June 2, 2021 2:00PM - 2:12PM Live |
M10.00001: Broadband quantum memory in a cavity via zero spectral dispersion Evgeny Moiseev, Arina Tashchilina, Sergey Moiseev, Barry C Sanders We seek to design experimentally feasible broadband, temporally multiplexed optical quantum memory with near-term applications to telecom bands. Specifically, we devise dispersion compensation for an impedance-matched narrow-band quantum memory by exploiting Raman processes over two three-level atomic subensembles, one for memory and the other for dispersion compensation. Our proposed broadband quantum memory employs three-level atoms with atomic density, cavity quality, and Raman-laser power and detuning chosen such that inverse cavity lifetime equals optical depth, the delay-bandwidth product exceeds 106, power efficiency exceeding 90% and at least one second of storage time, thereby leading to 106 modes for multiplexing. Our design will lead to significant multiplexing enhancement for quantum repeaters to be used for telecom quantum networks. |
Wednesday, June 2, 2021 2:12PM - 2:24PM Live |
M10.00002: An elementary 158 km long quantum network connecting room temperature quantum memories DOUNAN DU, Steven Sagona-Stophel, Paul Stankus, Olli-Pentti Saira, Dimitrios Katramatos, Mael Flament, Mehdi Namazi, Eden Figueroa First-generation long-distance quantum repeater networks require quantum memories to perform quantum-interference-mediated entanglement generation operations [1]. The ability to demonstrate these interconnections using real-life telecommunication fiber connections in a long-distance setting is paramount to realize a scalable quantum internet. |
Wednesday, June 2, 2021 2:24PM - 2:36PM Live |
M10.00003: All-Optical Hyperentangled Photonic Quantum Memory Nathan Arnold, Michelle Victora, Michael E Goggin, Paul G Kwiat Quantum optical memories are a key component to a variety of quantum information applications, from extending quantum communication channels to building high-efficiency single-photon sources to enabling protocols requiring multiple synchronized qubits. However, most current photon storage systems utilize light-matter interactions and are therefore not broadband; meanwhile the available broader-bandwidth photon storage systems operate with somewhat shorter storage times or require cryogenic operation. Here we develop a system with multiplexed free-space storage cavities, able to store single photons with high efficiency over variable delays, up to 12.5 µs, and over several nanometers bandwidth at room temperature. The system can store multiple qubits encoded in various degrees of freedom (e.g., spatial modes, time-bin, and polarization) simultaneously. This work has demonstrated storage of polarization states for 1.25 µs and retrieval through single-mode fiber with a state fidelity >99% and efficiency ~82%. A future goal for this experiment is to achieve storage of hyperentangled qubits, while also extending the storage time to ~100 µs by improving the optics used. |
Wednesday, June 2, 2021 2:36PM - 2:48PM Live |
M10.00004: Continuous protection from inhomogeneous dephasing Eilon Poem, Ran Finkelstein, Ofer Firstenberg We introduce a scheme for protecting a qubit from inhomogeneous dephasing, and we demonstrate it by eliminating the motional dephasing of a spin wave stored on hot vapor atoms. The scheme relies on continuously dressing the qubit with an auxiliary state, which exhibits an opposite and potentially enhanced sensitivity to the same source of inhomogeneity. By employing a pair of driving fields, we increase the protection range, circumvent qubit phase rotation, and obtain robustness to drive noise, similarly to the double-dressing technique in continuous dynamical decoupling. We outline the minimal and optimal conditions for protection. |
Wednesday, June 2, 2021 2:48PM - 3:00PM Live |
M10.00005: Broadband light storage based on superradiance effect in an ensemble of cold atoms Anindya Rastogi, Erhan Saglamyurek, Taras Hrushevskyi, Lindsay J LeBlanc Superradiance is a collective coherent emission effect that occurs in an initially excited ensemble of emitters due to a constructive interference among their dipole moments without an optical resonator or additional rephasing mechanisms. In this talk, I will introduce a quantum memory protocol based on this phenomenon of atomic-superradiance in a homogeneously-broadened, optically-dense, cold atomic ensemble. This protocol features non-adiabatic character, making it suitable for efficient storage of short temporal (broadband) pulses. Along with proof-of-principle experimental demonstrations, I will present our numerical analyses for bandwidth and efficiency scaling of the superradiance-mediated-storage. I will also compare the performance of this scheme with another non-adiabatic broadband memory (Autler-Townes Splitting protocol) that was introduced by our group, and look at recipes and advantages/disadvantages for optimal implementation of each protocol. These results are important for the development of high-performance quantum memories, which are the key ingredients of emerging quantum technologies such as large-scale quantum networks and quantum computers. |
Wednesday, June 2, 2021 3:00PM - 3:12PM Live |
M10.00006: Enhancing associative memory recall and storage capacity using confocal cavity QED Brendan Marsh, Yudan Guo, Ronen Kroeze, Sarang Gopalakrishnan, Surya Ganguli, Jonathan Keeling, Benjamin L Lev We introduce a near-term experimental platform for realizing an associative memory that outperforms the standard Hopfield neural network. It can simultaneously store many memories by using spinful bosons coupled to a degenerate multimode optical cavity. The associative memory is realized by a confocal cavity QED neural network, with the cavity modes serving as the synapses, connecting a network of superradiant atomic spin ensembles, which serve as the neurons. Memories are encoded in the connectivity matrix between the spins, and can be accessed through the input and output of patterns of light. Each aspect of the scheme is based on recently demonstrated technology using a confocal cavity and Bose-condensed atoms. The platform represents a new form of random spin system that can be controllably tuned between a ferromagnetic and a spin-glass regime. We find that the native spin dynamics, a form of discrete steepest descent, enhance the network's ability to store and recall memories beyond that of the standard Hopfield model. Surprisingly, the cavity QED dynamics can retrieve memories even when the system is deep in the spin glass phase, a regime in which associative memory was not thought to be possible. |
Wednesday, June 2, 2021 3:12PM - 3:24PM Live |
M10.00007: Quantum-memory spin-wave processor: multiplexed generation, programmable interference and detection Michal Parniak, Mateusz Mazelanik, Adam Leszczyński, Michał Lipka, Michał Dąbrowski, Wojciech Wasilewski Multiplexing stands at the core of modern optical communication, and it is also expected it will be highly beneficial, if not essential, for quantum communication with photons. Multiplexed quantum memories are then required to serve as quantum repeater nodes. We present a quantum memory based on a cold atomic ensemble that uses multiplexing of wavevectors (i.e. both angles of emission and storage times, combining spatial and temporal multiplexing) for the quasi-deterministic generation of single photons. Inside the memory, the photons can be stored in the form of spatially-extended spin waves, the phase of which can be modified via an ac-Stark shift protocol with spatial resolution. This allows us to experimentally implement linear-optical operations in the spin-wave domain, in particular demonstrating the Hong-Ou-Mandel interference for the pairs of collective spin-wave excitations. We envisage that such simple yet universal operations inside the memory can serve for optimizing the performance of the memory in the context of quantum repeaters, by implementing error-correction schemes in the memory. |
Wednesday, June 2, 2021 3:24PM - 3:36PM Live |
M10.00008: Optomechanical interface between telecom photons and spin quantum memories Denis D Sukachev, Prasoon Shandilya, David Lake, Matthew Mitchell, Paul Barclay Quantum networks enable a broad range of practical and fundamental applications spanning distributed quantum computing to sensing and metrology. A cornerstone of such networks is an interface between telecom photons and quantum memories. Here we demonstrate a novel approach based on cavity optomechanics that utilizes the susceptibility of spin qubits to strain. We use it to control electron spins of nitrogen-vacancy centers in diamond with photons in the 1550nm telecommunications wavelength band. This method does not involve qubit optical transitions and is insensitive to spectral diffusion. Furthermore, our approach can be applied to solid-state qubits in a wide variety of materials, expanding the toolbox for quantum information processing. |
Wednesday, June 2, 2021 3:36PM - 3:48PM Live |
M10.00009: Nondestructive Photon Measurement and Storage for Long Distance Trapped Ion Quantum Networking John M Hannegan, James Siverns, Jake Cassell, Qudsia Quraishi Trapped-ion-based quantum networks have demonstrated high fidelity entanglement combined with competitive two-node entanglement rates [1]. However, these networks have been limited to a few meters in distance, due to both heavy fiber attenuation of photons produced by ions, and relatively low single-photon collection efficiencies of trapped ion systems. I will discuss our newly proposed network architecture [2] for increasing entanglement rates between remote trapped-ion network nodes by integrating neutral-atom based nondestructive photon measurement [3] and storage [4,5]. I will show how this “hybrid” network can provide a 100-fold increase in the entanglement rate between two distant trapped Ba+ ions separated by up to 50 km. |
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