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Abstract:

Several methods, known as quantum process tomography, are available to characterize the evolution of quantum systems, a task of crucial importance. However, their complexity dramatically increases with the size of the system. Here we present a new method for quantum process tomography. We describe a new algorithm that can be used to selectively estimate any parameter characterizing a quantum process. Unlike any of its predecessors this new quantum tomographer combines two virtues: it requires investing a number of physical resources scaling polynomially with the number of qubits and at the same time it does not require any ancillary resources. We present the results of the first implementation of this quantum device, characterizing quantum processes affecting two qubits encoded in heralded single photons. Even for this small system our method displays clear advantages over the other existing ones. © 2011 American Physical Society.

Registro:

Documento: Artículo
Título:Selective and efficient quantum process tomography without ancilla
Autor:Schmiegelow, C.T.; Bendersky, A.; Larotonda, M.A.; Paz, J.P.
Filiación:Departamento de Física, IFIBA, Ciudad Universitaria, 1428 Buenos Aires, Argentina
CEILAP, CITEDEF, J.B. de La Salle 4397, 1603 Villa Martelli, Buenos Aires, Argentina
Palabras clave:Ancilla; Parameter characterizing; Physical resources; Quantum device; Quantum process; Quantum process tomography; Quantum system; Single photons; Small systems; Display devices; Quantum electronics; Quantum optics; Tomography; Multiphoton processes
Año:2011
Volumen:107
Número:10
DOI: http://dx.doi.org/10.1103/PhysRevLett.107.100502
Título revista:Physical Review Letters
Título revista abreviado:Phys Rev Lett
ISSN:00319007
CODEN:PRLTA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319007_v107_n10_p_Schmiegelow

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Citas:

---------- APA ----------
Schmiegelow, C.T., Bendersky, A., Larotonda, M.A. & Paz, J.P. (2011) . Selective and efficient quantum process tomography without ancilla. Physical Review Letters, 107(10).
http://dx.doi.org/10.1103/PhysRevLett.107.100502
---------- CHICAGO ----------
Schmiegelow, C.T., Bendersky, A., Larotonda, M.A., Paz, J.P. "Selective and efficient quantum process tomography without ancilla" . Physical Review Letters 107, no. 10 (2011).
http://dx.doi.org/10.1103/PhysRevLett.107.100502
---------- MLA ----------
Schmiegelow, C.T., Bendersky, A., Larotonda, M.A., Paz, J.P. "Selective and efficient quantum process tomography without ancilla" . Physical Review Letters, vol. 107, no. 10, 2011.
http://dx.doi.org/10.1103/PhysRevLett.107.100502
---------- VANCOUVER ----------
Schmiegelow, C.T., Bendersky, A., Larotonda, M.A., Paz, J.P. Selective and efficient quantum process tomography without ancilla. Phys Rev Lett. 2011;107(10).
http://dx.doi.org/10.1103/PhysRevLett.107.100502