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Ancilla-assisted quantum state tomography in multiqubit registers

Shukla, Abhishek and Rao, Rama Koteswara K and Mahesh, TS (2013) Ancilla-assisted quantum state tomography in multiqubit registers. In: Physical Review A, 87 (6). 062317_1-062317_8.

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Official URL: http://dx.doi.org/10.1103/PhysRevA.87.062317


The standard method of quantum state tomography (QST) relies on the measurement of a set of noncommuting observables, realized in a series of independent experiments. Ancilla-assisted QST (AAQST) proposed by Nieuwenhuizen and co-workers Phys. Rev. Lett. 92, 120402 (2004)] greatly reduces the number of independent measurements by exploiting an ancilla register in a known initial state. In suitable conditions AAQST allows mapping out density matrix of an input register in a single experiment. Here we describe methods for explicit construction of AAQST experiments in multiqubit registers. We also report nuclear magnetic resonance studies on AAQST of (i) a two-qubit input register using a one-qubit ancilla in an isotropic liquid-state system and (ii) a three-qubit input register using a two-qubit ancilla register in a partially oriented system. The experimental results confirm the effectiveness of AAQST in such multiqubit registers.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Physical Society.
Department/Centre: Division of Chemical Sciences > NMR Research Centre (Formerly Sophisticated Instruments Facility)
Division of Physical & Mathematical Sciences > Physics
Depositing User: Francis Jayakanth
Date Deposited: 03 Sep 2013 07:06
Last Modified: 03 Sep 2013 07:06
URI: http://eprints.iisc.ac.in/id/eprint/46972

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