{"url":"/method/vtde","slug":"vtde","name":"VTDE","full_name":"Variational Trace Distance Estimation","full_name_withheld":false,"description_markdown":"**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.","description_state":"present","introduced_year":null,"introduced_by":{"title":"Variational Quantum Algorithms for Trace Distance and Fidelity Estimation","paper":"/paper/variational-quantum-algorithms-for-trace","first_author":null,"n_authors":0,"url_abs":null,"archive_paper_url":"https://paperswithcode.com/paper/variational-quantum-algorithms-for-trace"},"source":{"url":"https://arxiv.org/abs/2012.05768v3","title":"Variational Quantum Algorithms for Trace Distance and Fidelity Estimation","url_on_a_paper_host":true},"code_snippet_url":null,"code_snippet_url_on_a_code_host":false,"categories":[{"area":"General","area_id":"general","collection":"Quantum Methods","url":"/methods/category/quantum-methods","pwc_aliases":[]}],"n_papers_tagged":0,"archive_num_papers":1,"papers_newest_first":[],"papers_shown":0,"tasks":[],"tasks_shown":0,"n_tasks":0,"usage_by_year":[],"row_source":"methods_table","archive":{"source":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","archive_url":"https://paperswithcode.com/method/vtde"},"syntology_read_at":"2026-09-24T18:15:14+00:00"}