Ancilla-assisted quantum state tomography in multiqubit registers
Data(s) |
17/06/2013
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Resumo |
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. |
Formato |
application/pdf |
Identificador |
http://eprints.iisc.ernet.in/46972/1/Phys_Rev_A_876_062317_2013.pdf 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. |
Publicador |
American Physical Society |
Relação |
http://dx.doi.org/10.1103/PhysRevA.87.062317 http://eprints.iisc.ernet.in/46972/ |
Palavras-Chave | #NMR Research Centre (Formerly SIF) #Physics |
Tipo |
Journal Article PeerReviewed |