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Empirical Evaluation of Circuit Approximations on Noisy Quantum Devices

January 28, 2022 - 1:00pm
Ellis Wilson

Abstract: Noisy Intermediate-Scale Quantum (NISQ) devices fail to produce
outputs with sufficient fidelity for deep circuits with many gates
today. Such devices suffer from read-out, multi-qubit gate and
cross-talk noise combined with short decoherence times limiting
circuit depth. This work develops a methodology to generate shorter
circuits with fewer multi-qubit gates whose unitary transformations
approximate the original reference one. It explores the benefit of
such generated approximations under NISQ devices. Experimental results
with Grover's algorithm, multiple-control Toffoli gates, and the
Transverse Field Ising Model show that such approximate circuits
produce higher fidelity results than longer, theoretically precise
circuits on NISQ devices, especially when the reference circuits have
many CNOT gates to begin with. With this ability to fine-tune
circuits, it is demonstrated that quantum computations can be
performed for more complex problems on today's devices than was
feasible before, sometimes even with a gain in overall precision by up
to 60\%.

Virtual Via Zoom:
(please note the link change this semester. also, there is no pizza this week)

(please note the time change from last semester)

Note: This seminar is part of a collaboration between RQS Institutions and will be made available to all RQS members.