Cavity-QED-based phase gate for photonic qubits

Non-Markovian Quantum Dynamics in Strongly Coupled Multimode Cavities Conditioned on Continuous Measurement

“…Our theory constitutes an ideal framework for the exploration of a wide range of many-body phenomena on the level of the reduced atomic non-Markovian dynamics in the strong-coupling regime, such as phase transitions [91], measurement-induced phase transitions [92,93], neural network like behaviors such as associative memories [28,94], cavity-enhanced transport [95][96][97][98][99] and superconductivity [100], continuous measurement of transport [101], or cavity cooling with higher capture range [102] and its monitoring [103]. New schemes for quantum information processing and production of entanglement [32] could also be investigated, exploiting the higher coherence achievable in the strong-coupling regime, the use of different cavity modes to realize quantum gates (or conversely the use of the atoms to realize quantum gates between photonic qubits [104,105]), or the potential of using the feedback formalism to implement error correction protocols. Finally, it is important to stress again that while we use the language of optical cavity QED, the underlying model is universal and can equally be applied to plasmonic cavities [40], cold atoms reservoirs [37][38][39], electron-phonon systems [36], or circuit QED [33,35].…”

Unitary decoupling treatment of a quadratic bimodal cavity quantum electrodynamics model

“…Compared with the typical CQED setup including a single mode in a high-Q superconductive cavity, the utilization of bimodal cavities [27] enables experimental investigations on tripartite systems. The aim is to drive and to reveal the appearance of quantum correlations [17], [28], [29] which might be useful also for implementing quantum information protocols [28], [30]. This explains the growing theoretical and experimental interest toward such systems [20], [28], [31], [32], [33], [34], [35], [36], [37], [38].…”

A Simple Scheme for Realizing a Multiqubit Controlled-Phase Gate Through a Resonant Interaction of Three-Level Atoms with a Single-Mode Cavity

“…Very recently, three important proposals about quantum phase gate of photonic qubits using a single three-level atom with Ξ-type, [15] V -type, [16] or Λ-type configuration [17] have been reported, among which zeroand one-photon Fock states of two intracavity modes are encoded as logic zero and one qubits. In particular, Dong [18] et al put forward an efficient scheme for realizing a two-qubit phase gate of photonic qubits through the dispersive interaction between a Λ-type atom and two polarized quantized cavity modes in 2009. Their protocol is more robust against atomic spontaneous emission and may have the potential application to increase the gating fidelity in experiment.…”