Direct estimation of decoherence rates

BUŽEK, Vladimír, Peter RAPČAN, Jochen RAU and Mário ZIMAN. Direct estimation of decoherence rates. Physical Review A (Atomic, Molecular, and Optical Physics). 2012, vol. 86, No 5, p. 1-6. ISSN 1050-2947. Available from: https://dx.doi.org/10.1103/PhysRevA.86.052109.

Basic information

• Original name: Direct estimation of decoherence rates
• Name in Czech: Přímá estimace dekoherence
• Authors: BUŽEK, Vladimír (703 Slovakia), Peter RAPČAN (703 Slovakia), Jochen RAU (276 Germany) and Mário ZIMAN (703 Slovakia, guarantor, belonging to the institution).
• Edition: Physical Review A (Atomic, Molecular, and Optical Physics), 2012, 1050-2947.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10000 1. Natural Sciences
• Country of publisher: United States of America
• Confidentiality degree: is not subject to a state or trade secret
• WWW: URL
• Impact factor: Impact factor: 3.042
• RIV identification code: RIV/00216224:14330/12:00057925
• Organization unit: Faculty of Informatics
• Doi: http://dx.doi.org/10.1103/PhysRevA.86.052109
• UT WoS: 000310967800003
• Keywords (in Czech): estimace; dekoherence; unitární k dizajn
• Keywords in English: estimation; decoherence; unitary k designs

Abstract

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.

Abstract (in Czech)

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.

Links

• GAP202/12/1142, research and development project: Name: Slabé zdroje entanglementu a náhodnosti

Investor: Czech Science Foundation