Methods › General › Quantum Methods › VTDE
Variational Trace Distance Estimation
VTDE
Introduced by Variational Quantum Algorithms for Trace Distance and Fidelity Estimation
archive 2025-07-28 Description, source and code snippet are the archive's method entry.
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.
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