Quantum State Preparation by Controlled Dissipation in Finite Time: From Classical to Quantum Controllers

Abstract

We propose a general scheme for dissipatively preparing arbitrary pure quantum states on a multipartite qubit register in a finite number of basic control blocks. Our "splitting-subspace" approach relies on control resources that are available in a number of scalable quantum technologies (complete unitary control on the target system, an ancillary resettable qubit and controlled-not gates between the target and the ancilla), and can be seen as a "quantum-controller" implementation of a sequence of classical feedback loops. We show how a large degree of flexibility exists in engineering the required conditional operations, and make explicit contact with a stabilization protocol used for dissipative quantum state preparation and entanglement generation in recent experiments with trapped ions.

10 pages, 2 figures. Submitted to CDC 2012

References in corpus (4)

• An Open-System Quantum Simulator with Trapped Ions
• Feedback control of quantum state reduction
• Modeling and Control of Quantum Systems: An Introduction
• Universal quantum interfaces

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