W-state preparation and entanglement dynamics in Rydberg atomic system based on the collective excitation enhancement

Abstract

We present a theoretical scheme to realize the highly entangled W state in the neutral atomic system by using the Rydberg blockade effect. Considering three neutral atoms trapped in an optical lattice with an equilateral triangle geometric configuration, we show that only one atom can be excited to the Rydberg excite state due to the Rydberg blockade effect. By choosing a non-zero detuning from the exact two-photon resonance in order to compensate for the blockade error caused by the finite interaction energy, we show that the three atoms W state can be generated. Moreover, we show that three atoms are entangled when W state is achieved with high fidelity.

Fast generation of W state via superadiabatic-based shortcut in circuit quantum electrodynamics*

“…The proposed superadiabatic-based scheme takes 1/12 of the evolution time 030307-5 in Ref. [33]. Therefore, the results also indicate that the adiabatic scheme for the generation of high-fidelity three-qubit W state requires a long time to satisfy the adiabatic criteria, while, the proposed superadiabatic one is speeded up with the merits of the adiabatic evolution.…”

“…In addition, in Ref. [33], the time to obtain the W state is about 0.6 µs. The proposed superadiabatic-based scheme takes 1/12 of the evolution time 030307-5 in Ref.…”

“…[20][21][22][23][24][25][26][27] Till now, the preparation of W states was demonstrated in different physical systems, such as, the ion trap system, [28] the cavity quantum electrodynamics (cavity QED), [29,30] circuit quantum electrodynamics (circuit QED), [31,32] and many other physical systems. [33,34] In different physical systems, due to their different devices and protocols, the time taken to prepare W states is also very different. Among them, the time used to prepare W state in Rydberg atomic system is 0.6 µs.…”

“…Among them, the time used to prepare W state in Rydberg atomic system is 0.6 µs. [33] Among the different physical systems, the circuit QED has become the promising candidate due to its long coherent time, easily being coupled with other physical system and scaled up to large scale. In the circuit QED, the widely used qubit is the superconducting transmon qubit.…”

Generation of three-dimensional entanglement between two antiblockade Rydberg atoms with detuning-compensation-induced effective resonance

“…On the other hand, Rydberg atom systems are one of the most promising candidates for implementing quantum computing [42][43][44][45][46][47][48][49][50][51][52] and quantum information processing [53][54][55][56][57][58][59][60][61][62] due to the long coherence time of Rydberg states and the natural and powerful interatomic interactions [63]. Rydberg atoms that are the neutral atoms with high lying excited states exhibit strong Rydberg-Rydberg interaction (RRI) with their adjacent ones.…”