TY - JOUR
T1 - Ancilla-Assisted Quantum Process Tomography
AU - Altepeter, J. B.
AU - Branning, D.
AU - Jeffrey, E.
AU - Wei, T. C.
AU - Kwiat, P. G.
AU - Thew, R. T.
AU - O’Brien, J. L.
AU - Nielsen, M. A.
AU - White, A. G.
PY - 2003
Y1 - 2003
N2 - Complete and precise characterization of a quantum dynamical process can be achieved via the method of quantum process tomography. Using a source of correlated photons, we have implemented several methods, each investigating a wide range of processes, e.g., unitary, decohering, and polarizing. One of these methods, ancilla-assisted process tomography (AAPT), makes use of an additional “ancilla system,” and we have theoretically determined the conditions when AAPT is possible. Surprisingly, entanglement is not required. We present data obtained using both separable and entangled input states. The use of entanglement yields superior results, however.
AB - Complete and precise characterization of a quantum dynamical process can be achieved via the method of quantum process tomography. Using a source of correlated photons, we have implemented several methods, each investigating a wide range of processes, e.g., unitary, decohering, and polarizing. One of these methods, ancilla-assisted process tomography (AAPT), makes use of an additional “ancilla system,” and we have theoretically determined the conditions when AAPT is possible. Surprisingly, entanglement is not required. We present data obtained using both separable and entangled input states. The use of entanglement yields superior results, however.
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U2 - 10.1103/PhysRevLett.90.193601
DO - 10.1103/PhysRevLett.90.193601
M3 - Article
AN - SCOPUS:84873322387
SN - 0031-9007
VL - 90
SP - 4
JO - Physical review letters
JF - Physical review letters
IS - 19
ER -