Storing quantum information in a generalised Dicke model via a simple rotation

A method for storing quantum information is presented for three-level atomic systems interacting dipolarly with a single radiation field. The method involves performing simple local SU(2) rotations on the Hamiltonian. Under equal detuning, these transformations decouple one of the atomic levels from the electromagnetic field for the Lambda- and V-configurations, yielding two effective two-level systems (qubits) plus an isolated atomic level; this allows for the exchange of information between the qubits. This rotation preserves the quantum phase diagram of the system. The method could possibly be used as a means to manipulate quantum information, such as storage and retrieval, or communication via a transmission line.

Automated summary

This paper presents a method for storing and manipulating quantum information using rotations on the Hamiltonian. The rotations can decouple the atomic levels from the electromagnetic field under certain conditions, enabling information exchange between qubits.