Unambiguous discrimination of general quantum operations
arxiv(2024)
Abstract
The discrimination of quantum operations has long been an intriguing
challenge, with theoretical research significantly advancing our understanding
of the quantum features in discriminating quantum objects. This challenge is
closely related to the discrimination of quantum states, and proof-of-principle
demonstrations of the latter have already been realized using optical photons.
However, the experimental demonstration of discriminating general quantum
operations, including both unitary and non-unitary operations, has remained
elusive. In general quantum systems, especially those with high dimensions, the
preparation of arbitrary quantum states and the implementation of arbitrary
quantum operations and generalized measurements are non-trivial tasks. Here,
for the first time, we experimentally demonstrate the optimal unambiguous
discrimination of up to 6 displacement operators and the unambiguous
discrimination of non-unitary quantum operations. Our results demonstrate
powerful tools for experimental research in quantum information processing and
are expected to stimulate a wide range of valuable applications in the field of
quantum sensing.
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