Entanglement, decoherence, and quantum information

A.‐S. F. Obada, Abdel‐Baset A. Mohamed, Hosney A. Hessein

Gershon Kurizki, Abraham G. Kofman, David Petrosyan +1 more

The impediment towards the successful development of the field of quantum information (QI) is decoherence , i.e., the loss of entanglement by the effect of the environment on the systems of interest. An important challenge is that of QI engineering, by entanglement and decoherence control, in complex systems, such as unimolecular and bimolecular systems, that can simultaneously handle large amounts of QI. Progress towards this goal can be achieved by: (a) decay modification and decoherence suppression in molecules, using laser-induced phase and amplitude modulation of rovibrational levels and inter-mode couplings; (b) transfer of internal-translational entanglement and teleportation of wavepackets via molecular dissociation and collisions.

YS Kim, Jong Chan Lee, Osung Kwon +1 more

Decoherence, often caused by unavoidable coupling with the environment, leads to degradation of quantum coherence. For a multipartite quantum system, decoherence leads to degradation of entanglement and, in certain cases, entanglement sudden death. Tackling decoherence, thus, is a critical issue faced in quantum information, as entanglement is a vital resource for many quantum information applications including quantum computing, quantum cryptography, quantum teleportation, and quantum metrology. Here, we propose and demonstrate a novel scheme to protect entanglement from decoherence. Our entanglement protection scheme makes use of the quantum measurement itself for actively battling against decoherence and it can effectively circumvent even entanglement sudden death (ESD).

Zhaohua Wang

As the most peculiar and incredible feature of quantum mechanics, there is a great gap between quantum information and classical information, which is evident in the new field of quantum information.Based on this, this paper discusses quantum entanglement control and decoherence and hopes that it can bring some enlightenment for the related industry.

Zeilinger