On the generation of sequential unitary gates from continuous time Schrodinger equations driven by external fields

Claudio Altafini

Quantum Information Processing, 1(3):207-224, 2002.

In all the various proposals for quantum computers, a common feature is that the quantum circuits are expected to be made of cascades of unitary transformations acting on the quantum states. A framework is proposed to express these elementary quantum gates directly in terms of the control inputs entering into the continuous time forced Schrodinger equation.

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