TY - JOUR
T1 - Quantum-state tomography using a single apparatus
AU - Mehmani, B.
AU - Allahverdyan, A. E.
AU - Nieuwenhuizen, Th M.
PY - 2008/3/31
Y1 - 2008/3/31
N2 - The density matrix of a two-level system (spin, atom) is usually determined by measuring the three noncommuting components of the Pauli vector. This density matrix can also be obtained via the measurement data of two commuting variables, using a single apparatus. This is done by coupling the two-level system to a mode of radiation field, where the atom-field interaction is described with the Jaynes-Cummings model. The mode starts its evolution from a known coherent state. The unknown initial state of the atom is found by measuring two commuting observables: the population difference of the atom and the photon number of the field. We discuss the advantages of this setup and its possible applications.
AB - The density matrix of a two-level system (spin, atom) is usually determined by measuring the three noncommuting components of the Pauli vector. This density matrix can also be obtained via the measurement data of two commuting variables, using a single apparatus. This is done by coupling the two-level system to a mode of radiation field, where the atom-field interaction is described with the Jaynes-Cummings model. The mode starts its evolution from a known coherent state. The unknown initial state of the atom is found by measuring two commuting observables: the population difference of the atom and the photon number of the field. We discuss the advantages of this setup and its possible applications.
UR - http://www.scopus.com/inward/record.url?scp=41549085134&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.77.032122
DO - 10.1103/PhysRevA.77.032122
M3 - Artículo
AN - SCOPUS:41549085134
SN - 1050-2947
VL - 77
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 3
M1 - 032122
ER -