-1 for a black-box unitary transformation U

Dominik Janzing, Thomas Beth. -1 for a black-box unitary transformation U. Quantum Information & Computation, 2(3):192-197, 2002. [doi]

@article{JanzingB02,
  title = {-1 for a black-box unitary transformation U},
  author = {Dominik Janzing and Thomas Beth},
  year = {2002},
  url = {http://portal.acm.org/citation.cfm?id=2011432},
  researchr = {https://researchr.org/publication/JanzingB02},
  cites = {0},
  citedby = {0},
  journal = {Quantum Information & Computation},
  volume = {2},
  number = {3},
  pages = {192-197},
}