Asymmetric universal entangling machine

Details Asymmetric universal entangling machine Asymmetric universal entangling machine

2004-12-23

arxiv.org/abs/quant-ph/0412188v1

Physics

Quantum Physics

28 pages, 3 figures

Scientific paper

10.1134/1.2055929

We give a definition of asymmetric universal entangling machine which entangles a system in an unknown state to a specially prepared ancilla. The machine produces a fixed state-independent amount of entanglement in exchange to a fixed degradation of the system state fidelity. We describe explicitly such a machine for any quantum system having $d$ levels and prove its optimality. We show that a $d^2$-dimensional ancilla is sufficient for reaching optimality. The introduced machine is a generalization to a number of widely investigated universal quantum devices such as the symmetric and asymmetric quantum cloners, the symmetric quantum entangler, the quantum information distributor and the universal-NOT gate.

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