Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session C03: Quantum Information ScienceInvited Undergraduate

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Sponsoring Units: DPF DPB Chair: Marcel Demarteau, Argonne Lab Room: Sheraton Plaza E 
Saturday, April 13, 2019 1:30PM  2:06PM 
C03.00001: Simulating Black Holes with Superconducting Quantum Processors Invited Speaker: Irfan Siddiqi Tremendous progress has been made over the past decade in quantum coherent devices based on superconducting tunneling junctions and resonators, resulting in the development of nascent quantum processors with of order 10100 qubits of varying connectivity. Such devices, though not resilient to arbitrary errors, can nonetheless be controlled to execute shallow circuitdepth quantum algorithms designed to operate with only a few logical gate operations while taking advantage of parallel processing and available classical resources to minimize coherence requirements. These specialized processors can be used to conduct quantum simulation experiments where entanglement and other hallmarks of quantum mechanics can be used to efficiently explore the properties of highly correlated matter. I discuss here the use of superconducting qutrits and ternary quantum logic to mimic the properties of information scrambling believed to be characteristic of a black hole. Specifically, a unitary operation is constructed to maximally spread information, and a quantum state is teleported through a scrambling and unscrambling sequence to determine whether information deposited into a black hole can be retrieved by probing the radiation field that is emitted from it and is being collected by an external observer. 
Saturday, April 13, 2019 2:06PM  2:42PM 
C03.00002: Accelerating the search for axionic dark matter with quantum information technology Invited Speaker: Konrad W Lehnert Several hypothetical origins for dark matter, including the QCD axion, posit the existence of feeble but everpresent source terms in Maxwell’s equations. Because these terms would oscillate at an unknown frequency, searches for this type of dark matter scan a tunable resonant cavity, with spectrally narrow sensitivity, through frequency looking for excess electrical energy in the cavity. Quantum noise now limits the rate at which frequency space can be searched, and for the QCD axion the time required to falsify the benchmark theory is prohibitively long. I will describe how the quantumlimited search rate can be accelerated using technology emerging from the effort to create quantum computers. In particular, I will describe how quantum squeezing of microwave fields increases the bandwidth of the resonant cavities without diminishing their sensitivity. 
Saturday, April 13, 2019 2:42PM  3:18PM 
C03.00003: Atomic Quantum Engineering for Fundamental Physics Invited Speaker: Monika H SchleierSmith How can we harness progress in quantum control to advance understanding of fundamental physics? I will describe experiments motivated by two complementary paradigms: quantum simulation and precision measurement. Inspired by toy models for information scrambling in black holes, we have engineered a coldatom quantum simulator wherein photons mediate nonlocal interactions conducive to efficiently spreading quantum information across many degrees of freedom. These same interactions can enable massively parallel generation of correlated atom pairs, a resource for approaching fundamental quantum limits in precision sensing. 
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