Phys. Rev. A 72, 032311 (2005) [8 pages]n-qubit-controlled phase gate with superconducting quantum-interference devices coupled to a resonatorReceived 3 February 2005; revised 23 May 2005; published 9 September 2005 We present a way to realize an n-qubit controlled phase gate with superconducting quantum-interference devices (SQUIDs) by coupling them to a superconducting resonator. In this proposal, the two logical states of a qubit are represented by the two lowest levels of a SQUID. An intermediate level of each SQUID is utilized to facilitate coherent control and manipulation of quantum states of the qubits. It is interesting to note that an n-qubit controlled phase gate can be achieved with n SQUIDs by successively applying a π∕2 Jaynes-Cummings pulse to each of the n−1 control SQUIDs before and after a π Jaynes-Cummings pulse on the target SQUID. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.72.032311
DOI:
10.1103/PhysRevA.72.032311
PACS:
03.67.Lx, 85.25.Dq, 42.50.Dv
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