Title:	Characterization of quantum dynamics using quantum error correction
Authors:	Omkar, S. Srikanth, R. Banerjee, Subhashish
Issue Date:	Jan-2015
Publisher:	American Physical Society
Citation:	Physical Review A, 2015, Vol. 91, p012324
Abstract:	Characterizing noisy quantum processes is important to quantum computation and communication (QCC), since quantum systems are generally open. To date, all methods of characterization of quantum dynamics (CQD), typically implemented by quantum process tomography, are off-line, i.e., QCC and CQD are not concurrent, as they require distinct state preparations. Here we introduce a method, “quantum error correction based characterization of dynamics,” in which the initial state is any element from the code space of a quantum error correcting code that can protect the state from arbitrary errors acting on the subsytem subjected to unknown dynamics. The statistics of stabilizer measurements, with possible unitary preprocessing operations, are used to characterize the noise, while the observed syndrome can be used to correct the noisy state. Our method requires at most 2(4n−1) configurations to characterize arbitrary noise acting on n qubits.
Description:	Open Access.
URI:	http://hdl.handle.net/2289/6240
ISSN:	1094-1622 (Online) 1050-2947
Alternative Location:	http://arxiv.org/abs/1405.0964 http://dx.doi.org/10.1103/PhysRevA.91.012324 http://adsabs.harvard.edu/abs/2015PhRvA..91a2324O
Copyright:	2015 The American Physical Society
Appears in Collections:	Research Papers (TP)

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