SQuInT 2022 Program
Full Program | Thursday | Friday | Saturday | All Sessions | Posters | Talks
SESSION 6: Quantum optics and network (Islands Ballroom)Chair: (Elohim Becerra (UNM)) | |
| 8:30 am - 9:15 am | Joseph Lukens, Oak Ridge National Lab (invited) Elastic optical quantum networks: connecting two worlds | Abstract. Lightwave technology has revolutionized networking, enabling a vast global infrastructure of high-speed communications that supports the internet today. Throughout this development, elastic or flex-grid optical networking has proven itself a powerful paradigm for maximizing utilization of optical resources via reconfigurable allocation of wavelength channels and bandwidths matched to user demand. In this talk, I will describe research expanding elastic optical networking to quantum networks as well. Through routing and provisioning of broadband photonic entanglement with wavelength-selective switches, quantum networks of ever-increasing size can be envisioned, as indicated by our proof-of-principle experiments demonstrating adaptive polarization entanglement distribution in a deployed quantum local area network. After discussing the integration of important practical capabilities into our testbed - including White Rabbit timing synchronization and quantum key distribution - I will conclude with recent efforts toward scaling to much larger networks, focusing on addressable ultrabroadband entanglement sources, genetic-algorithm-aided design, and Bayesian inference. As a bridge connecting highly successful classical optical networks to their more nascent quantum counterparts, elastic optical networking should continue to offer a valuable framework in which quantum networks can thrive and grow in both size and functionality. |
| 9:15 am - 9:45 am | Matthew Brown, University of Oregon Quantum advantage in interferometric imaging | Abstract. Just over 100 years ago, Michelson and Pease measured the diameter of a star using the interference of visible-spectrum light fields collected at two positions in an apertured telescope. The spatial coherence, distilled from a spatially incoherent object through propagation, between the collected light fields is guaranteed by the van Cittert-Zernike theorem. The angular resolution of the collection of apertures is limited by the separation of apertures, rather than the size of a single aperture. This technique has been employed recently in radio astronomy to image supermassive black holes. Yet, measurements in the visible spectrum are limited to comparatively short baselines due to loss or cost, whereas the radio regime circumvents this issue by measuring the electric field at each location. In 2012, Gottesman, Jennewein and Croke suggested using a nonlocally distributed single photon as a phase reference, increasing the telescope separation using quantum repeaters to overcome loss. In a first of a kind measurement, we report the use of a heralded single photon from a pulsed, parametric downconversion source as a non-local oscillator to image a double-slit intensity pattern illuminating a diffuser that has a matching single temporal-spectral mode, Lambertian scattering, and approximate spatial incoherence. Using signal-to-noise ratio per coincidence as a metric, we find that the nonlocal oscillator outperforms a weak classical local oscillator. |
| 9:45 am - 10:15 am | Prajit Dhara, University of Arizona Zero-Added-Loss Entangled Photon Multiplexing for Ground- and Space-Based Quantum Networks | Abstract. We propose a scheme for optical entanglement distribution in quantum networks based on a quasi-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 'zero-added-loss multiplexing' (ZALM) Bell pair source 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 channel efficiency \(\eta\) of downlinks 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 - improve entanglement generation rate scaling by \(O\sqrt \eta\). Based on numerical analyses, we estimate our protocol to achieve \(>10^2 ebits/s\) at memory multiplexing of \(10^4\) spin qubits for ground distance larger than \(10^4\) km, with the spin-spin Bell state fidelity exceeding 99%. Our architecture presents a blueprint for realizing global-scale quantum networks in the near term. Additionally, we demonstrate the utility of the proposed architecture for ground quantum networks when deployed on a linear quantum repeater chain. |
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SQuInT Chief Organizer
Akimasa Miyake, Associate Professor
amiyake@unm.edu
SQuInT Co-Organizer
Hartmut Haeffner, Associate Professor, UC Berkeley
hhaeffner@berkeley.edu
SQuInT Administrator
Dwight Zier
d29zier@unm.edu
505 277-1850
SQuInT Program Committee
Alberto Alonso, Postdoc, UC Berkeley
Philip Blocher, Postdoc, UNM
Neha Yadav, Postdoc, UC Berkeley
Cunlu Zhou, Postdoc, UNM
SQuInT Founder
Ivan Deutsch, Regents' Professor, CQuIC Director
ideutsch@unm.edu
