Mathematics

Research on Mathematics Discussed by C.T. Schmiegelow and Co-Researchers

  2012 APR 17 - (VerticalNews.com) -- Current study results from the report, "Selective and efficient quantum process tomography without ancilla," have been published. According to the authors of a study from Buenos Aires, Argentina, "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," wrote C.T. Schmiegelow and colleagues.

  The researchers concluded: "Even for this small system our method displays clear advantages over the other existing ones."

  Schmiegelow and colleagues published their study in Physical Review Letters (Selective and efficient quantum process tomography without ancilla. Physical Review Letters, 2011;107(10):100502).

  For more information, contact C.T. Schmiegelow, Departamento de Fisica & IFIBA, FCEyN, UBA, Pabellon 1, Ciudad Universitaria, 1428 Buenos Aires, Argentina.

  Keywords: City:Buenos Aires, Country:Argentina, Region:South America, Mathematics.

  This article was prepared by VerticalNews Mathematics editors from staff and other reports. Copyright 2012, VerticalNews Mathematics via VerticalNews.com.