Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevA.83.032110
Title: High-efficiency tomographic reconstruction of quantum states by quantum nondemolition measurements
Authors: Huang, J.S. 
Wei, L.F.
Oh, C.H. 
Issue Date: 14-Mar-2011
Citation: Huang, J.S., Wei, L.F., Oh, C.H. (2011-03-14). High-efficiency tomographic reconstruction of quantum states by quantum nondemolition measurements. Physical Review A - Atomic, Molecular, and Optical Physics 83 (3) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevA.83.032110
Abstract: We propose a high-efficiency scheme to tomographically reconstruct an unknown quantum state by using a series of quantum nondemolition (QND) measurements. The proposed QND measurements of the qubits are implemented by probing the stationary transmissions through a driven dispersively coupled resonator. It is shown that only one kind of QND measurement is sufficient to determine all the diagonal elements of the density matrix of the detected quantum state. The remaining nondiagonal elements can be similarly determined by transferring them to the diagonal locations after a series of unitary operations. Compared with the tomographic reconstructions based on the usual destructive projective measurements (wherein one such measurement can determine only one diagonal element of the density matrix), the present reconstructive approach exhibits significantly high efficiency. Specifically, our generic proposal is demonstrated by the experimental circuit quantum electrodynamics systems with a few Josephson charge qubits. © 2011 American Physical Society.
Source Title: Physical Review A - Atomic, Molecular, and Optical Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/117036
ISSN: 10502947
DOI: 10.1103/PhysRevA.83.032110
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.