Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 36: Quantum Computation: Benchmarking and Certification
FM 36.3: Talk
Tuesday, September 24, 2019, 14:45–15:00, 2006
Certifying the building blocks of quantum computers from Bell's theorem — •Jean-Daniel Bancal1,2, Pavel Sekatski2, and Nicolas Sangouard2 — 1Department of Applied Physics, University of Geneva, 1211 Geneva, Switzerland — 2Quantum Optics Theory Group, Universität Basel, CH-4056 Basel, Switzerland
Quantum computers hold great promises, but as their experimental realization concretizes it becomes clear that, like most quantum technologies, they are sensitive to implementation imperfections. Due to their large spectrum of possible application, device-independent certification schemes are needed to guarantee their proper working and certify their results. Recently, it was shown that practical imperfections do not constitute a fundamental barrier to this goal: black-box certification is in principle possible [see e.g. B. W. Reichard et al., Nature 496, 456 (2013)]. Realistic recipe that could be used in today's experiments were however not provided. Here, we present a framework for the device-independent certification of quantum channels that is inherently noise-tolerant. We show that it provides a generic tool for a bottom-up certification of quantum computers and technologies. We certify building blocks such as multi-qubit gates, quantum memories, quantum converters, Bell state measurements, quantum instruments, etc. Our test validates the capability of an imperfect device to be used in a larger quantum technology device, independently of its actual implementation and of the purpose for which it is used. This brings device-independent certification to the scope of currently available devices.