Manipulating the Quantum State of an Electrical Circuit

作者：D. Vion, A. Aassime, Audrey Cottet, P. Joyez, H. Pothier, C. Urbina, D. Esteve, Michel Devoret · 发表于：Science · 年份：2002 · DOI：10.1126/science.1069372 · 被引用次数：1624 · 研究领域：Quantum Information and Cryptography、Quantum Computing Algorithms and Architecture、Quantum and electron transport phenomena

We have designed and operated a superconducting tunnel junction circuit that behaves as a two-level atom: the "quantronium." An arbitrary evolution of its quantum state can be programmed with a series of microwave pulses, and a projective measurement of the state can be performed by a pulsed readout subcircuit. The measured quality factor of quantum coherence Qphi approximately 25,000 is sufficiently high that a solid-state quantum processor based on this type of circuit can be envisioned.