Quantum information processing in cavities: A review

Abstract

Processing of information and computation undergoing a paradigmatic shift since the realization of the enormous potential of quantum features to perform these tasks. Coupled cavity array is one of the well-studied systems to carry out these tasks. It is a versatile platform to build quantum networks for distributed information processing and communication. Cavities have the salient feature of retaining photons for longer, thereby enabling them to travel coherently through the array without losing them in dissipation. Several research groups have successfully demonstrated the coupling of cavities and implemented various quantum information protocols. These advancements pave the way for implementing cavity arrays for large scale quantum communications and computations. This article reviews theoretical proposals and discusses a few pertinent experimental realizations of quantum information tasks in cavities.

Direct measurement of atomic entanglement via cavity photon statistics

“…However, it changes the phase of the cavity field [40,44]. The dispersive coupling has been used for realizing quantum gates [45], generating nonclassical states [46,47] and controlling photon transfer [48,49], etc. The setup shown in Fig.…”

Demonstration of deterministic SWAP gate between superconducting and frequency-encoded microwave-photon qubits

“…However, an incomparably larger number of qubits is required in order to make such quantum machines truly useful. Therefore, in near future, it would be indispensable to distribute quantum information among remote quantum processors [3][4][5][6], using deterministic quantum interactions between stationary and flying qubits [7,8].…”