Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session K10: Focus Session: Quantum MemoryFocus Session Live Streamed
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Chair: Shimon Kolkowitz, Wisconsin Room: Grand Ballroom D |
Wednesday, June 1, 2022 10:30AM - 11:00AM |
K10.00001: Large-bandwidth photonic storage and manipulation with cold and ultracold atoms Invited Speaker: Lindsay J LeBlanc In the quest for optical quantum memories that are compatible with common single-photon sources, and which can be integrated into land- and satellite-based optical quantum communications networks, atoms play an important role for providing large-bandwidth and long storage time possibilities, using wavelengths that can be integrated into anticipated standard systems. In our experiments, we use both the conventional "fast" and the Autler-Townes protocols to realize large-bandwidth storage and manipulations of photonic signals, leading to fast and relatively low-noise signals, all of which can be implemented using minimal experimental resources. We demonstrated these protocols using laser-cooled and Bose-condensed atoms as the storage medium, and explored how the performance of each approach could be optimised [in terms of noise, efficiency, and resource requirements (laser power/optical depth)] under realistic parameters. Looking forward, we consider the potential for these protocols to contribute to tasks including wavelength conversion, multimode storage, and quantum information processing. |
Wednesday, June 1, 2022 11:00AM - 11:30AM |
K10.00002: Broadband quantum memories for photonic quantum states Invited Speaker: Virginia O Lorenz Quantum memories that enable storage and retrieval of photonic quantum states are key components of quantum networks and local quantum information processing schemes. As with any processing task, high bandwidth is favored for scalability, but quantum memories that store GHz-THz bandwidth photonic quantum states have suffered from low efficiency. Experimentally and theoretically determining the optimal system and parameters for broadband quantum storage and retrieval is an ongoing area of research. |
Wednesday, June 1, 2022 11:30AM - 11:42AM |
K10.00003: Optimizing photon-mediated operations using external control fields Herbert F Fotso A variety of systems have been successfully implemented as qubits for quantum information processing. Many of these systems offer specific benefits and can be used advantageously for particular functions in a large scale hybrid quantum platform. In this context, optimal light-matter interfaces between different quantum systems is essential. In this talk, we will examine how spectral properties of quantum emitters can be controlled with external field protocols. In particular we will discuss two-photon interference between different quantum emitters that can be hindered by spectral differences between the systems. This problem is exacerbated in solid state systems where fluctuations in the surrounding environment leads to spectral diffusion. We will show that external field protocols can mitigate spectral diffusion for emitters in dynamic environments. We will also show that these protocols can restore photon indistinguishability between otherwise spectrally different quantum emitters and thus improve the efficiency of essential two-photon interference operations. |
Wednesday, June 1, 2022 11:42AM - 11:54AM |
K10.00004: Towards practical quantum repeaters using room-temperature vapor technology Mehdi Namazi, Alex Craddock, Yang Wang, Mael Flament, Rourke Sekelsky Quantum entanglement sources and memories are critical for quantum networking architecture. To build memory-assisted quantum repeaters, the entanglement source needs to generate photons that are ideal for optical fiber transmission and are simultaneously suitable for storage and buffering in a quantum memory. It is ideal to address these challenges without the need of additional quantum devices such as frequency converters. Most of the available sources, such as spontaneous parametric down conversion sources (SPDC), generate photons that are too spectrally broad for interfacing with atomic quantum devices. The use of optical parametric amplifiers allows for addressing this issue with the cost of significantly increasing the complexity of the devices. |
Wednesday, June 1, 2022 11:54AM - 12:06PM |
K10.00005: Wavelength conversion of ns-long pulses in cold atomic ensemble with extreme optical depth Sreesh V, Divya Bharadwaj, Paul Anderson, Rubayet Al Maruf, Michael Reimer, Michal Bajcsy Interfacing atoms with solid-state emitters such as quantum dots, which emit short (~ns-long) photon pulses, necessitates broadband (~GHz) operation of the atomic medium. Here, we theoretically investigate single photon wavelength conversion using atomic ensembles. In particular, we consider the conversion of photons (~895 nm) emitted by semiconductor quantum dots (InAsP/InAs) to wavelengths suitable for satellite-based QKD (794 nm) or fibre-based (1469 nm) telecommunication using Cs atoms. We show that efficient broad bandwidth photon conversion can be realized with atomic clouds of high optical depths (103 - 104) which can be created by confining the atoms inside a hollow-core optical fibre. We compare the efficiency of conversion to other platforms and discuss the role of the applied control fields, as well as of the geometry and temperature of the atomic ensemble inside the hollow-core fibre in achieving high conversion efficiencies. |
Wednesday, June 1, 2022 12:06PM - 12:18PM |
K10.00006: Reversible tuning of quantum dot emission to caesium D1 line Rubayet Al Maruf, Divya Bharadwaj, Paul Anderson, Sreesh Venuturumilli, Jiawei Qiu, Yujia Yuan, Behrooz Semnani, Sonell Malik, Mohd Zeeshan, Dan Dalacu, Philip Poole, Michael E Reimer, Michal Bajcsy We describe a new method for reversible and bi-directional in-situ precision tuning of the wavelength of single photons emitted by a quantum dot embedded in a semiconductor nanowire, using the deposition of inert gas. This method, which can be reversed by increasing the temperature or using focused laser to evaporate the deposited gas, has allowed us to match the D1 transition (∼895 nm) of cesium atom. We report the emitted photon characteristics including second-order correlation function g(2)(τ) and linewidth, as well as the lifetime of the quantum dot before and after the wavelength tuning. We also discuss our initial experiments studying interactions between the single photons and atomic ensembles. |
Wednesday, June 1, 2022 12:18PM - 12:30PM |
K10.00007: Device-Independent Quantum Key Distribution Between Two Ion Trap Nodes David P Nadlinger, Peter Drmota, Bethan C Nichol, Gabriel Araneda, Dougal Main, Raghavendra Srinivas, David M Lucas, Chris J Ballance, Kirill Ivanov, Ernest Y Tan, Pavel Sekatski, Rüdiger L Urbanke, Renato Renner, Nicolas Sangouard, Jean-Daniel Bancal Quantum theory promises that measurements on two entangled systems can yield correlated outcomes that are fundamentally unpredictable to any third party. Following the pioneering work of Ekert [1], we present the experimental realisation of a quantum key distribution (QKD) protocol for cryptography with device-independent security: to prove secrecy, we treat the systems as “black boxes”, relying only on measurement statistics observed during the key generation process. This mitigates many possible attacks on QKD, but requires a great number of observations of a large, detection-loophole-free Bell inequality violation. |
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