QUANTUM SUPREMACY: BENCHMARKING
THE SYCAMORE PROCESSOR (QUANTUMCASTS)
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Quantum
supremacy: Benchmarking the Sycamore processor talk is presented by Research
Scientist Kevin Satzinger for the APS March Meeting 2020.
The promise
of quantum computers is that certain computational tasks might be executed
exponentially faster on a quantum processor than on a classical processor. A
fundamental challenge is to build a high-fidelity processor capable of running
quantum algorithms in an exponentially large computational space. Here we
report the use of a processor with 53 programmable superconducting qubits. In
our Sycamore processor, each qubit interacts with four neighbors in a
rectangular lattice using tunable couplers. A key systems engineering advance
of this device is achieving high-fidelity single- and two-qubit operations, not
just in isolation but also while performing a realistic computation with
simultaneous gate operations across the entire processor. We benchmark the
Sycamore processor using cross-entropy benchmarking, a scalable method to
evaluate system performance. Our largest system benchmarks feature circuits that
are intractable for classical hardware, culminating in the demonstration of
quantum supremacy. Furthermore, the fidelities from full-system benchmarks
agree with what we predict from individual gate and measurement fidelities,
verifying the digital error model and presenting a path forward to quantum
error correction.
Nature 574,
505-510 (2019)
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