n-qubit-controlled phase gate with superconducting quantum-interference devices coupled to a resonator
Chui-Ping Yang, Siyuan Han
DOI 10.1103/PhysRevA.72.032311 · Physical Review A
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Abstract
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.
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