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Using tools from classical signal processing, we show how to determine the dimensionality of a quantum system as well as the effective size of the environment's memory from observable dynamics in a model-independent way. We discuss the dependenc[...]texto impreso
?ehá?ek, J. ; Stoklasa, Bohumil ; Koutný, Dominik ; Hradil, Zdenek ; Sánchez Soto, Luis Lorenzo | The American Physical Society | 2019-11-07We derive fundamental precision bounds for single-point axial localization. For Gaussian beams, this ultimate limit can be achieved with a single intensity scan, provided the camera is placed at one of two optimal transverse detection planes. He[...]texto impreso
We introduce schemes for quantum computing based on local measurements on entangled resource states. This work elaborates on the framework established in Gross and Eisert [Phys. Rev. Lett. 98, 220503 (2007); quant-ph/0609149]. Our method makes u[...]texto impreso
The narrow spectral bandwith (0.4 A) of a Nd-glass laser was tuned over a range of 40 A to populate selectively the 6f level of cesium atoms. The resulting variation of the multiphoton ionization probability was investigated as a function of the[...]texto impreso
A family of diffeomorphism-invariant Seiberg-Witten deformations of gravity is constructed. In a first step Seiberg-Witten maps for an SO(1,3) gauge symmetry are obtained for constant deformation parameters. This includes maps for the vierbein,[...]texto impreso
Pérez García, David ; Wolf, M.M. ; Sanz, M. ; Verstraete, F. ; Cirac, J.I. | The American Physical Society | 2008-04-25We show that the existence of string order in a given quantum state is intimately related to the presence of a local symmetry by proving that both concepts are equivalent within the framework of finitely correlated states. Once this connection i[...]
