Swap Test-based characterization of decoherence in universal quantum computers
article
Unreliable quantum processes stemming from noisy operations and interactions with the environment represent one of the greatest challenges to be overcome in the development of scalable, fault-tolerant universal quantum computers. Generic characterizations of such quantum processes, however, can be very resource-intensive, and many tools have been developed for identifying particular aspects of a quantum computer. In this article, we verify whether a tool called Swap Test can be used in order to identify decoherence in an implementation-agnostic way. Simulations and experimental results show that a modified version of a Toffoli Swap Test can be employed as an alternative to a full quantum process tomography, consuming considerably less computational resources as a consequence. Moreover, it is also shown to be able to simulate in a generic quantum computer a quantum optical communication link that employs two-photon interference.
TNO Identifier
986394
ISSN
15700755
Source
Quantum Information Processing, 22(5)
Publisher
Springer
Article nr.
220
Collation
14 p.
Place of publication
New York, NY, USA
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