Process tomography via sequential measurements on a single quantum system

Bassa, H. and Goyal, S. K. and Choudhary, S. K. and Uys, H. and Diósi, Lajos (2015) Process tomography via sequential measurements on a single quantum system. PHYSICAL REVIEW A, 92 (3). ISSN 2469-9926

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Abstract

We utilize a discrete (sequential) measurement protocol to investigate quantum process tomog- raphy of a single two-level quantum system, with an unknown initial state, undergoing Rabi oscil- lations. The ignorance of the dynamical parameters is encoded into a continuous-variable classical system which is coupled to the two-level quantum system via a generalized Hamiltonian. This com- bined estimate of the quantum state and dynamical parameters is updated by using the information obtained from sequential measurements on the quantum system and, after a sufficient waiting pe- riod, faithful state monitoring and parameter determination is obtained. Numerical evidence is used to demonstrate the convergence of the state estimate to the true state of the hybrid system.

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