Phys. Rev. Lett. 99, 030501 (2007) [4 pages]Quantum Information Processing with Delocalized Qubits under Global ControlReceived 21 November 2006; published 18 July 2007 Conventional quantum computing schemes are incompatible with nanometer-scale “hardware,” where the closely packed spins cannot be individually controlled. We report the first experimental demonstration of a global control paradigm: logical qubits delocalize along a spin chain and are addressed via the two terminal spins. Using NMR studies on a three-spin molecule, we implement a globally clocked quantum mirror that outperforms the equivalent swap network. We then extend the protocol to support dense qubit storage and demonstrate this experimentally via Deutsch and Deutsch-Jozsa algorithms. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.030501
DOI:
10.1103/PhysRevLett.99.030501
PACS:
03.67.Lx, 03.67.Hk, 03.67.Pp, 73.21.Hb
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