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 JQIS  Vol.5 No.1 , March 2015
Constructing Entanglers in 2-Players–N-Strategies Quantum Game
Abstract: In quantum games based on 2-player-N-strategies classical games, each player has a quNit (a normalized vector in an N-dimensional Hilbert space HN) upon which he applies his strategy (a matrix U∈SU(N)). The players draw their payoffs from a state . Here  and J (both determined by the game’s referee) are respectively an unentangled 2-quNit (pure) state and a unitary operator such that  is partially entangled. The existence of pure strategy Nash equilibrium in the quantum game is intimately related to the degree of entanglement of . Hence, it is practical to design the entangler J= J(β) to be dependent on a single real parameter β that controls the degree of entanglement of , such that its von-Neumann entropy SN(β) is continuous and obtains any value in . Designing J(β) for N=2 is quite standard. Extension to N>2 is not obvious, and here we suggest an algorithm to achieve it. Such construction provides a special quantum gate that should be a useful tool not only in quantum games but, more generally, as a special gate in manipulating quantum information protocols.
Cite this paper: Avishai, Y. (2015) Constructing Entanglers in 2-Players–N-Strategies Quantum Game. Journal of Quantum Information Science, 5, 16-23. doi: 10.4236/jqis.2015.51003.
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