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Title: Ancilla-assisted quantum state tomography in multiqubit registers
Authors: Shukla, Abhishek
Rao, K. Rama Koteswara
Dept. of Physics
Keywords: Ancilla-assisted quantum
Multiqubit registers
Multiqubit registers
Issue Date: Jun-2013
Publisher: American Physical Society
Citation: Physical Review A, 87(6),062317.
Abstract: 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.
ISSN: 1050-2947
Appears in Collections:JOURNAL ARTICLES

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