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Ancilla-assisted quantum state tomography in multiqubit registers.
- Source :
-
Physical Review A: Atomic, Molecular & Optical Physics . Jun2013, Vol. 87 Issue 6-A, p1-8. 8p. - Publication Year :
- 2013
-
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 arid 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 [ABSTRACT FROM AUTHOR]
- Subjects :
- *QUANTUM states
*TOMOGRAPHY
*DENSITY matrices
*QUBITS
*OPTICS
Subjects
Details
- Language :
- English
- ISSN :
- 10502947
- Volume :
- 87
- Issue :
- 6-A
- Database :
- Academic Search Index
- Journal :
- Physical Review A: Atomic, Molecular & Optical Physics
- Publication Type :
- Periodical
- Accession number :
- 89380343
- Full Text :
- https://doi.org/10.1103/PhysRevA.87.062317