Indirect control with quantum accessor: coherent control by initial state preparation

Details Indirect control with quantum accessor: coherent control by initial state preparation Indirect control with quantum accessor: coherent control by initial state preparation

2007-12-04

arxiv.org/abs/0712.0488v2

Physics

Quantum Physics

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Scientific paper

This is the second one in our series of papers on indirect quantum control assisted by quantum accessor. In this paper we propose and study a new class of indirect quantum control(IDQC) scheme based on the initial states preparation of the accessor. In the present scheme, after the initial state of the accessor is properly prepared, the system is controlled by repeatedly switching on and off the interaction between the system and the accessor. This is different from the protocol of our first paper, where we manipulate the interaction between the controlled system and the accessor. We prove the controllability of the controlled system for the proposed indirect control scheme. Furthermore, we give an example with two coupled spins qubits to illustrate the scheme, the concrete control process and the controllability.

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