Creating entangled states between SQUID rings and electromagnetic fields

Abstract

The problem of entangling a SQUID ring inductively coupled to an electromagnetic field mode is considered here. It is demonstrated by solving the time dependent Schrödinger equation that a system with varying superpositions of states and levels of entanglement between the components of this system can be created. These calculations can be extended to include the effects of dissipative environments coupled to the SQUID ring-field mode system. It is also demonstrated that even including such decohering environments, it is possible to maintain a sufficient degree of entanglement over time scales that would be required for quantum technologies. © 2006 Springer Science+Business Media, Inc.