68,176 research outputs found
Accelerated Randomized Benchmarking
Quantum information processing offers promising advances for a wide range of
fields and applications, provided that we can efficiently assess the
performance of the control applied in candidate systems. That is, we must be
able to determine whether we have implemented a desired gate, and refine
accordingly. Randomized benchmarking reduces the difficulty of this task by
exploiting symmetries in quantum operations.
Here, we bound the resources required for benchmarking and show that, with
prior information, we can achieve several orders of magnitude better accuracy
than in traditional approaches to benchmarking. Moreover, by building on
state-of-the-art classical algorithms, we reach these accuracies with
near-optimal resources. Our approach requires an order of magnitude less data
to achieve the same accuracies and to provide online estimates of the errors in
the reported fidelities. We also show that our approach is useful for physical
devices by comparing to simulations.
Our results thus enable the application of randomized benchmarking in new
regimes, and dramatically reduce the experimental effort required to assess
control fidelities in quantum systems. Finally, our work is based on
open-source scientific libraries, and can readily be applied in systems of
interest.Comment: 10 pages, full source code at
https://github.com/cgranade/accelerated-randomized-benchmarking #quantuminfo
#benchmarkin
Philosophical Aspects of Quantum Information Theory
Quantum information theory represents a rich subject of discussion for those
interested in the philosphical and foundational issues surrounding quantum
mechanics for a simple reason: one can cast its central concerns in terms of a
long-familiar question: How does the quantum world differ from the classical
one? Moreover, deployment of the concepts of information and computation in
novel contexts hints at new (or better) means of understanding quantum
mechanics, and perhaps even invites re-assessment of traditional material
conceptions of the basic nature of the physical world. In this paper I review
some of these philosophical aspects of quantum information theory, begining
with an elementary survey of the theory, seeking to highlight some of the
principles and heuristics involved. We move on to a discussion of the nature
and definition of quantum information and deploy the findings in discussing the
puzzles surrounding teleportation. The final two sections discuss,
respectively, what one might learn from the development of quantum computation
(both about the nature of quantum systems and about the nature of computation)
and consider the impact of quantum information theory on the traditional
foundational questions of quantum mechanics (treating of the views of
Zeilinger, Bub and Fuchs, amongst others).Comment: LaTeX; 55pp; 3 figs. Forthcoming in Rickles (ed.) The Ashgate
Companion to the New Philosophy of Physic
- …