Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session U19: Quantum Simulators for Quantum Complex Network ScienceInvited
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Sponsoring Units: DAMOP Chair: Lincoln Carr, Colorado School of Mines Room: 207 |
Thursday, March 5, 2020 2:30PM - 3:06PM |
U19.00001: Hyperbolic Lattices in Circuit QED Invited Speaker: Alicia Kollar After two decades of development, superconducting circuits have emerged as a rich platform for quantum computation and simulation. Lattices of coplanar waveguide (CPW) resonators have been shown to produce artificial materials for microwave pho- tons, where interactions can be introduced either via non-linear resonator materials or qubit-resonator coupling. Here, we highlight the previously-overlooked property that these lattice sites are deformable and permit tight-binding lattices which are unattain- able, even in solid-state systems. Networks of CPW resonators can create a new class of materials, including lattices in an effective hyperbolic space with constant nega- tive curvature. We will discuss the mathematical tools needed to study the spectra of such structures and present experimental data showing that hyperbolic analogs of the kagome lattice in which photons in this lattice propagate along geodesics of the hy- perbolic metric, rather than along the standard straight lines of flat Euclidean, space can be produced in the lab. Additionally, we will highlight the prospects for stud- ies of information and entanglement propagation in hyperbolic geometries, as well as realization of other non-flat structures, such as trees or models with varying curvature. |
Thursday, March 5, 2020 3:06PM - 3:42PM |
U19.00002: Optically networked color centers Invited Speaker: Jelena Vuckovic Most quantum technologies rely on homogeneous, long lived qubits which are efficiently optically interconnected. To achieve this goal, we have been studying color centers in diamond and silicon carbide, in combination with novel fabrication techniques, and our photonics inverse design approach. |
Thursday, March 5, 2020 3:42PM - 4:18PM |
U19.00003: Entangled Radiofrequency-Photonic Sensor Network Invited Speaker: Zheshen Zhang Quantum metrology enables a measurement sensitivity below the standard quantum limit (SQL), as demonstrated in the Laser Interferometer Gravitational-wave Observatory (LIGO). As a unique quantum resource, entanglement has been utilized to enhance the performance of, e.g., microscopy, target detection, and phase estimation. To date, almost all existing entanglement-enhanced sensing demonstrations are restricted to improving the performance of probing optical parameters at a single sensor, but a multitude of applications rely on an array of sensors that work collectively to undertake sensing tasks in the radiofrequency (RF) and microwave spectral ranges. Here, we propose and experimentally demonstrate a reconfigurable RF-photonic sensor network comprised of three entangled sensor nodes. We show that the entanglement shared by the sensors can be tailored to substantially increase the precision of parameter estimation in networked sensing tasks, such as estimating the angle of arrival (AoA) of an RF field. The entangled RF-photonic sensor network achieves an estimation variance 3.2 dB below the SQL in measuring the average field amplitudes and an estimation variance 3.5 dB (3.2 dB) below the SQL in measuring the AoA at a central (edge) node. Our work would open a new avenue toward utilizing quantum metrology for ultrasensitive positioning, navigation, and timing. |
Thursday, March 5, 2020 4:18PM - 4:54PM |
U19.00004: Quantum Optical Neural Network with Multimode Cavity QED Invited Speaker: Yudan Guo The ability to engineer inter-particle interaction is at the heart of quantum simulation of many-body systems. However, the necessary nonlocal interaction in complex neural networks poses challenges to traditional implementation of ultracold atoms quantum simulators. We present our theoretical and experimental studies of photon-mediated interactions with atoms trapped inside a multimode confocal cavity. Superposition of different photon modes with incommensurate spatial profiles gives rise to a sign-changing and non-local interaction. Through numerical simulations, we show that the connectivity resulting from such non-local interaction will allow us to explore spin models featuring an associative memory to spin glass transition. In addition, the dissipative cavity photon dynamics facilitate more efficient spin relaxation to low energy states than the textbook Glauber dynamics. Combined with our recent experimental demonstration of cavity-mediated spin-spin interaction and characterization of the non-local interaction, a quantum optical neural network is within our reach. |
Thursday, March 5, 2020 4:54PM - 5:30PM |
U19.00005: Complex Networks in Multimode Continuous Variable Quantum Optics Invited Speaker: Valentina Parigi
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