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SUMMARY:ESE Fall Colloquium Seminar - "Toward Practical Quantum Advantage: Many-body Physics in the NISQ Era"
DESCRIPTION:Quantum processors of today are already capable of surpassing classical supercomputers on certain specialized tasks [1]. A current milestone for the quantum information science community is the fulfilment of quantum computational advantage on a practical problem of interest. The beginning of this talk will outline our technical progress on realizing various high-fidelity quantum gates on Google’s Sycamore processor\, such as iSWAP and CPHASE. We then focus on two experiments studying many-body phenomena that have previously proven elusive on all quantum computing or simulation platforms: discrete time-crystals (DTC) and quantum scrambling. \nIn the DTC work\, we implement Floquet dynamics on a 1D chain of 20 superconducting qubits [2]. Engineered disorders in the two-qubit couplings allow many-body localization (MBL) to occur despite strong external drive\, thereby stabilizing a non-equilibrium phase of matter [3]. We carefully validate the phase structure of the DTC by probing the average response of all eigenstates belonging to the Floquet unitary. Using a suitable choice of order parameter\, we further identify the location of the MBL-ergodicity crossover via experimentally observed finite-size effects. These results open a direct path to studying quantum phase transitions and critical phenomena on NISQ quantum processors. In the quantum scrambling work [4]\, we deploy a full 2D grid of 53 qubits and implement quantum circuits with tunable complexity. By measuring the quantum fluctuation of out-of-time-ordered correlators (OTOCs)\, we resolve the two key requisites of quantum scrambling: operator spreading and operator entanglement. Results from the most complex quantum circuits require ~100 hours to simulate on a CPU core via best-known classical algorithms\, indicating the potential for achieving practical quantum advantage in the near term. \n[1] Google AI Quantum and Collaborators\, Nature 574\, 505 (2019). \n[2] X. Mi\, M. Ippoliti\, K. Kechedzhi\, V. Khemani\, P. Roushan et al.\,  arXiv:2107.13571 (2021). \n[3] M. Ippoliti\, K. Kechedzhi\, R. Moessner\, S. Shivaji\, V. Khemani\,  PRX Quantum (In press). \n[4] X. Mi\, P. Roushan\, C. Quintana\, K. Kechedzhi\, V. Smelyanskiy\, Y. Chen et al.\, arXiv:2101.08870 (2021).
URL:https://seasevents.nmsdev7.com/event/ese-fall-colloquium-seminar-toward-practical-quantum-advantage-many-body-physics-in-the-nisq-era/
LOCATION:Raisler Lounge (Room 225)\, Towne Building\, 220 South 33rd Street\, Philadelphia\, PA\, 19104\, United States
ORGANIZER;CN="Electrical and Systems Engineering":MAILTO:eseevents@seas.upenn.edu
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