Resources needed for non-unitary quantum operations

Raam Uzdin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Non-unitary operations generated by an effective non-Hermitian Hamiltonian can be used to create quantum state manipulations which are impossible in Hermitian quantum mechanics. These operations include state preparation (or cooling) and non-orthogonal state discrimination. In this work we put a lower bound on the resources needed for the construction of some given non-unitary evolution. Passive systems are studied in detail and a general feature of such systems is derived. After interpreting our results using the singular value decomposition, several examples are studied analytically. In particular, we put a lower bound on the resources needed for non-Hermitian state preparation and non-orthogonal state discrimination.

Original languageAmerican English
Article number145302
JournalJournal of Physics A: Mathematical and Theoretical
Issue number14
StatePublished - 12 Apr 2013


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