Averin D V
Department of Physics and Astronomy, SUNY Stony Brook, Stony Brook, New York 11794-3800, USA.
Phys Rev Lett. 2002 May 20;88(20):207901. doi: 10.1103/PhysRevLett.88.207901. Epub 2002 May 1.
The concept of quantum nondemolition (QND) measurement is extended to coherent oscillations in an individual two-state system. Such a measurement enables direct observation of an intrinsic spectrum of these oscillations avoiding the detector-induced dephasing that affects the standard (non-QND) measurements. The suggested scheme can be realized in Josephson-junction qubits which combine flux and charge dynamics.
量子无损（QND）测量的概念被扩展到单个二态系统中的相干振荡。这种测量能够直接观测这些振荡的本征谱，避免了影响标准（非QND）测量的探测器诱导退相。所提出的方案可以在结合了磁通和电荷动力学的约瑟夫森结量子比特中实现。
