Direct estimation of decoherence rates

• Název česky: Přímá estimace dekoherence
• Autoři: BUŽEK Vladimír; RAPČAN Peter; RAU Jochen; ZIMAN Mário
• Rok publikování: 2012
• Druh: Článek v odborném periodiku
• Časopis / Zdroj: Physical Review A (Atomic, Molecular, and Optical Physics)
• Fakulta / Pracoviště MU: Fakulta informatiky
• www: http://link.aps.org/doi/10.1103/PhysRevA.86.052109
• Doi: http://dx.doi.org/10.1103/PhysRevA.86.052109
• Obor: Teorie informace
• Klíčová slova: estimation; decoherence; unitary k designs
• Popis: The decoherence rate is a nonlinear channel parameter that describes quantitatively the decay of the off-diagonal elements of a density operator in the decoherence basis. We address the question of how to experimentally access such a nonlinear parameter directly without the need for complete process tomography. In particular, we design a simple experiment working with two copies of the channel, in which the registered mean value of a two-valued measurement directly determines the value of the average decoherence rate. No prior knowledge of the decoherence basis is required.

Související projekty

• Weak sources of entanglement and randomness