Scalable quantum computation via local control of only two qubits

Details Scalable quantum computation via local control of only two qubits Scalable quantum computation via local control of only two qubits

2009-05-20

arxiv.org/abs/0905.3373v2

Phys. Rev. A 81, 040303(R) (2010)

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevA.81.040303

We apply quantum control techniques to control a large spin chain by only acting on two qubits at one of its ends, thereby implementing universal quantum computation by a combination of quantum gates on the latter and swap operations across the chain. It is shown that the control sequences can be computed and implemented efficiently. We discuss the application of these ideas to physical systems such as superconducting qubits in which full control of long chains is challenging.

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