Effects of dipolar coupling on an entanglement storage device

Quantum computation requires efficient long-term storage devices to preserve quantum states. An attractive candidate for such storage devices is qubits connected to a common dissipative environment. Multiple qubits in a common environment can have a persistent entanglement. Hence these systems can be used as an efficient storage device of entanglement. However, the existence of a common environment often requires the physical proximity of the qubits and hence results in direct dipolar coupling between the qubits. In this presentation, we will explicitly show the effects of the dipolar coupling on the environment-induced entanglement using a recently-proposed fluctuation-regulated quantum master equation [A.Chakrabarti and R. Bhattacharyya, Phys. Rev. A 97, 063837 (2018)]. Our result indicates that non-secular part of the dipolar coupling results in reduced persistent entanglement and hence less efficiency of the storage devices. We will also discuss the properties of efficient storage devices that mitigate the detrimental effects of the dipolar coupling on the stored entanglement.