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What is: Variational Trace Distance Estimation?

SourceVariational Quantum Algorithms for Trace Distance and Fidelity Estimation
Year2000
Data SourceCC BY-SA - https://paperswithcode.com

Variational Trace Distance Estimation, or VTDE, is a variational algorithm for trace norm estimation that only involves one ancillary qubit. Notably, the cost function in VTDE gathers information from a single-qubit observable and thus could avoid the barren plateau issue with logarithmic depth parameterized circuits.