Phys. Rev. A 62, 012310 (2000) [8 pages]Approaching five-bit NMR quantum computingReceived 14 May 1999; revised 11 October 1999; published 15 June 2000 Nuclear-magnetic-resonance (NMR) quantum computation is a fruitful arena in which to develop and demonstrate an enhanced capability for quantum control over molecular systems, regardless of the prospects, which may be limited, for building a quantum computer superior to a conventional computer for any computing task. We demonstrate a five-bit NMR quantum computer that distinguishes among various functions on four bits, making use of quantum parallelism, an example of the Deutsch-Jozsa problem. Its construction draws on the recognition of the sufficiency of linear coupling along a chain of nuclear spins, the synthesis of a suitably coupled molecule containing four distinct nuclear species, and the use of a multichannel spectrometer. Radio-frequency pulse sequences are described to execute controlled-NOT gates on two adjoining spins while leaving the other three spins essentially unaffected. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.62.012310
DOI:
10.1103/PhysRevA.62.012310
PACS:
03.67.Lx, 89.80.+h, 75.10.Jm
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