Dissipative stabilization of quantum-feedback-based multipartite entanglement with Rydberg atoms

Abstract

A quantum-feedback-based scheme is proposed for generating multipartite entanglements of Rydberg atoms in a dissipative optical cavity. The Rydberg blockade mechanism efficiently prevents double excitations of the system, which is further exploited to speed up the stabilization of an entangled state with a single Rydberg state excitation. The corresponding feedback operations are greatly simplified, since only one regular atom needs to be controlled during the whole process, irrespective of the number of particles. The form of entangled state is also adjustable via regulating the Rabi frequencies of driving fields. Moreover, a relatively long-life time of the high-lying Rydberg level guarantees a high fidelity in a realistic situation.

Unconventional Rydberg pumping and applications in quantum information processing

“…The appearance affirms the feasibility of our quantum error correction scheme and the correctness of the reduced system. In experiment, the transition |0 ↔ |r requires two indirect transitions to realize [62]. Firstly, the ground state |0 dispersively coupled with a intermediate state |e by an optical cavity with strength g b , detuning −∆ b .…”

“…The appearance affirms the feasibility of our quantum error correction scheme and the correctness of the reduced system. In experiment, the transition |0 ↔ |r requires two indirect transitions to realize [62]. In Fig.…”

Conversion of entangled states with nitrogen-vacancy centers coupled to microtoroidal resonators

“…Furthermore, it is even considered as an important effect in living biological bodies in recent years, for instance, the entanglement may be related to Avian compass [18], and the entanglement and teleportation using living cell is also possible [19]. Owing to its importance, many theoretical and experimental efforts for generating entanglement have been one focus of the current study [20][21][22][23][24][25][26][27][28]. There are two most common classes of entangled states for a multipartite system, i.e., GHZ state and W state, which cannot be converted to each other by local operations and classical communication (LOCC) [29,30].…”

Detecting a single atom in a cavity using the $χ^{(2)}$ nonlinear medium

“…Based on these models [5][6][7], the interaction of different types of atoms with various light fields [8][9][10][11][12][13] has been extensively studied and many interesting quantum optical phenomena have been probed, such as vacuum Rabi splitting [14], squeezing phenomena of optical fields [15][16][17], single photon blockade [18], and so on. Furthermore, many schemes for quantum information and quantum computation using atom-cavity-coupled systems have been proposed, for examples, realizations of quantum gates [19,20], generations of entangled states [21][22][23][24][25][26][27][28], operations of a quantum phase gate [29], and so on [30][31][32][33][34][35][36].…”