Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Z28: Recent Advances in Quantum CommunicationInvited Live Streamed
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Sponsoring Units: DQI Chair: Saikat Guha Room: McCormick Place W-190A |
Friday, March 18, 2022 11:30AM - 12:06PM |
Z28.00001: Quantum Communication Takes Off: Distributing entanglement from moving platforms Invited Speaker: Paul G Kwiat We have now seen a growing number of quantum communication demonstrations in deployed optical fibers, setting the stage for an eventual wired quantum network. However, there are numerous applications where free-space links are either preferable (far less loss) or essential (no fiber links available). Moreover, for some of these, such as distributed quantum sensing, it will be necessary to have mobile reconfigurable nodes. Finally, there are applications that require nodes in space, both as links between widely separated ground networks, and to facilitate quantum experiments in previously unreachable regimes, e.g., where relativistic effects have a measurable effect. Here I will overview some of these and some current efforts to establish entanglement sources on moving platforms, including drones and satellites. |
Friday, March 18, 2022 12:06PM - 12:42PM |
Z28.00002: Quantum Networks with Artificial Atoms: Learning from Large Datasets for Improved Architectures Invited Speaker: Dirk Englund There's been tremendous progress in theory and experiment of quantum networks as a means of distributing quantum information over long distances. This talk will focus on one approach, based on quantum memories encoded in spins and coupled to photons via color centers in diamond. From large datasets of such color centers -- silicon vacancy and tin-vacancy defects in particular -- it is clear that the inhomogeneous distribution of optical transitions can be reliably kept below ~ 10 GHz, and that within this distribution there is no significant correlation with spin coherence properties. This invites protocols tailored to take advantage of this spectral distribution for wavelength division multiplexed addressing. To this end, we will discuss a new scheme for optical entanglement distribution in quantum networks based on a near-deterministic entangled photon pair source. By combining heralded photonic Bell pair generation with spectral mode conversion to interface with quantum memories, the scheme eliminates switching losses due to multiplexing. We analyze this approach for the particularly challenging problem of long-baseline entanglement distribution via satellites and ground-based memories, where it unlocks additional advantages: (i) the substantially higher atmospheric transmission η of down-links vs. uplinks with realistic adaptive optics, and (ii) photon loss occurring before interaction with the quantum memory – i.e., Alice and Bob receiving rather than transmitting – reduces memory requirements by O(η). |
Friday, March 18, 2022 12:42PM - 1:18PM |
Z28.00003: Individual Addressing of Trapped Ions Invited Speaker: Sara Mouradian Trapped ions are a leading platform for quantum information processing with long coherence times and high fidelity and fast gates. To fully harness the power of the innate all-to-all connectivity in trapped ion systems, it is necessary to have single ion addressing. Here, we present a simple integrated photonics system with outputs directly imaged onto an ion chain with a high numerical aperture objective, enabling individual control over all the ions in a trap. This control will allow us to create arbitrary entangled states across an ion chain and explore protocols for sharing that entanglement between isolated modules in a larger quantum network. |
Friday, March 18, 2022 1:18PM - 1:54PM |
Z28.00004: On the Performance Evaluation of Two Distributed Quantum Architectures Invited Speaker: Gayane Vardoyan Distributed quantum applications impose requirements on the quality of the quantum states that they consume. When analyzing architecture implementations of quantum hardware, characterizing this quality forms an important factor in understanding their performance. Fundamental characteristics of quantum hardware lead to inherent tradeoffs between the quality of states and traditional performance metrics such as throughput. Furthermore, any real-world implementation of quantum hardware exhibits time-dependent noise that degrades the quality of quantum states over time. Here, we study the performance of two possible architectures for interfacing a quantum processor with a quantum network. The first corresponds to the current experimental state of the art in which the same device functions both as a processor and a network device. The second corresponds to a future architecture that separates these two functions over two distinct devices. We model these architectures as Markov chains and compare their quality of executing quantum operations and producing entangled quantum states as functions of their memory lifetimes, as well as the time that it takes to perform various operations within each architecture. As an illustrative example, we apply our analysis to architectures based on Nitrogen-Vacancy centers in diamond, where we find that for present-day device parameters one architecture is more suited to computation-heavy applications, and the other for network-heavy ones. We validate our analysis with the quantum network simulator NetSquid. Besides the detailed study of these architectures, a novel contribution of our work are several formulas that connect an understanding of waiting time distributions to the decay of quantum quality over time for the most common noise models employed in quantum technologies. This provides a valuable new tool for performance evaluation experts, and its applications extend beyond the two architectures studied in this work. |
Friday, March 18, 2022 1:54PM - 2:30PM |
Z28.00005: Protocols for fast and resource efficient quantum repeaters Invited Speaker: Liang Jiang The internet has had a revolutionary impact on our world. The vision of quantum internet – capable of transmitting quantum information – will provide novel applications that are provabl impossible by communicating only classical information. An outstanding challenge of buildin large scale quantum networks is to establish a quantum channel that can connect remot parties efficiently. Direct quantum communication with optical fiber network over continental scale suffers from fiber attenuation and exponential reduction of communication rate. To overcome this challenge, quantum repeaters and quantum satellites have been proposed and demonstrated to boost communication rates over long distances. In this talk, I will introduce these technologies with the promise of enabling global quantum networks. In addition, I will discuss related research frontiers and promising applications of quantum internet. |
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