Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session S28: Recent Advances in AMO Quantum InformationInvited Live Streamed Undergrad Friendly
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Sponsoring Units: DQI Chair: Mark Saffman, University of Wisconsin - Madison Room: McCormick Place W-190A |
Thursday, March 17, 2022 8:00AM - 8:36AM |
S28.00001: Quantum Science with Tweezer Arrays Invited Speaker: Manuel Endres Atom-by-atom assembly with optical tweezers enables the generation of defect-free atomic arrays with flexible geometric arrangements. Combined with controlled excitation to Rydberg states, this has become a highly versatile platform for quantum computing, simulation, and metrology. I will review these developments with a focus on two valence electron atoms: The rich level structure of such atoms enables novel cooling, control, and read-out schemes, which we have used in demonstrations of record imaging and two qubit entanglement fidelities for neutral atoms. At the same time, this direction merges high-precision spectroscopy with single-atom control resulting in a novel type of optical clock platform. Further, by applying this high-fidelity approach to many-body systems, we recently uncovered the emergence of random pure state ensembles in chaotic dynamics. Such random ensembles play an important role in quantum information science associated with device verification, supremacy tests, and quantification of complexity growth, and we show benchmarking of a Rydberg atom quantum simulator as a concrete application. |
Thursday, March 17, 2022 8:36AM - 9:12AM |
S28.00002: Quantum sensing with solid state spins Invited Speaker: Paola Cappellaro Detection of AC magnetic fields at the nanoscale is critical in applications ranging from fundamental physics to materials science. Isolated nitrogen-vacancy centers in diamond can achieve the desired spatial resolution with high sensitivity. Still, there are several limitations to their applicability, ranging from a reduced spectral range to limited capabilities in detecting vectorial information. For example, vector AC magnetometry currently relies on using different orientations of an ensemble of sensors, with degraded spatial resolution. Control methods based on Floquet driving can open new opportunities and broaden the scope of applicability of spin sensors. Here I will present a novel protocol that exploits a single NV to reconstruct the vectorial components of an AC magnetic field, by tuning a continuous driving to distinct resonance conditions. As an experimental proof-of-principle, I’ll show how to map the spatial distribution of an AC field generated by a copper wire on the surface of the diamond. The proposed protocol combines high sensitivity, broad dynamic range, and sensitivity to both coherent and stochastic signals, with broad applications in condensed matter physics. |
Thursday, March 17, 2022 9:12AM - 9:48AM |
S28.00003: Spectral engineering of the environment Invited Speaker: Ania C Jayich
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Thursday, March 17, 2022 9:48AM - 10:24AM |
S28.00004: Quantum computing and networking with trapped ions; or - Two things to do with two qubits two metres apart Invited Speaker: David Lucas I will describe two recent experiments performed using an elementary two-node quantum network at Oxford, which links two independent ion traps, separated by 2 metres, via a single-photon optical fibre interface. Both experiments rely on the ability to generate high-fidelity (>90%) entanglement between trapped-ion qubits, one stored in each trap, at high speed (up to 200 entanglement events per second). In the first experiment [Nadlinger et al., arXiv 2021] we present a realization of a complete quantum key distribution (QKD) protocol immune to the vulnerabilities of the physical devices used in the implementation. In this "device-independent" QKD protocol, we can put a limit on the amount of information accessible to an eavesdropping adversary by using Bell's Theorem, as first proposed 30 years ago by Ekert [Phys.Rev.Lett. 1991]. The second experiment [Nichol et al., arXiv 2021] uses the remote entanglement as a resource to enhance the precision attainable in comparing the frequency of a narrow optical transition in each ion, as is required for accurate comparisons of optical clocks, with applications to probing the space-time variation of fundamental constants, searching for exotic particles, or geodesy. We surpass the "standard quantum limit" which applies to independent systems, and approach the so-called Heisenberg limit, the ultimate measurement precision attainable for entangled particles. This halves the averaging time needed to reach a given precision; if the precision is limited by dephasing of the spectroscopy laser, as is typically the case for today's optical clocks, then the use of entanglement gives a further factor of 2 improvement. Prospects for future experiments, with application to quantum computing, will be discussed. |
Thursday, March 17, 2022 10:24AM - 11:00AM |
S28.00005: Quantum computing with continuous variable optical states Invited Speaker: Nicolas Menicucci Quantum computing is poised to offer revolutionary capabilities for medicine, materials, and cybersecurity. With several platforms showing promise as a viable quantum computing architecture, the ultimate winner remains unclear. Optical quantum computing offers the tantalizing promise of room-temperature operation and vast scalability. This technology has advanced far beyond its single-photon origins to encompass more robust and interesting states of light that serve as quantum information carriers with built-in resilience to decoherence. These so-called bosonic codes, when combined with a demonstrably scalable architecture like a continuous-variable cluster state, bring fault-tolerant quantum computing with optical systems within reach. The missing pieces are high enough squeezing in laboratory experiments and optical production of the bosonic-code states used as the information carriers. In this talk, I will give an overview of recent key advances in scalability and fault tolerance for optical quantum computing. |
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