167 research outputs found
Discrete-event simulation unmasks the quantum Cheshire Cat
It is shown that discrete-event simulation accurately reproduces the
experimental data of a single-neutron interferometry experiment [T. Denkmayr
{\sl et al.}, Nat. Commun. 5, 4492 (2014)] and provides a logically consistent,
paradox-free, cause-and-effect explanation of the quantum Cheshire cat effect
without invoking the notion that the neutron and its magnetic moment separate.
Describing the experimental neutron data using weak-measurement theory is shown
to be useless for unravelling the quantum Cheshire cat effect
Benchmarking gate-based quantum computers
With the advent of public access to small gate-based quantum processors, it
becomes necessary to develop a benchmarking methodology such that independent
researchers can validate the operation of these processors. We explore the
usefulness of a number of simple quantum circuits as benchmarks for gate-based
quantum computing devices and show that circuits performing identity operations
are very simple, scalable and sensitive to gate errors and are therefore very
well suited for this task. We illustrate the procedure by presenting benchmark
results for the IBM Quantum Experience, a cloud-based platform for gate-based
quantum computing.Comment: Accepted for publication in Computer Physics Communication
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