Abstract
We propose a mechanism of ground-state antiblockade of Rydberg atoms, which is then exploited to prepare two-atom entangled state via three different kinds of pulses. First we use the pulses in the form of sin2 and cos2 functions and obtain a maximally entangled state at an accurate interaction time. Then the method of stimulated Raman adiabatic passage (STIRAP) is adopted for the entanglement generation, which is immune to the fluctuations of revelent parameters but requires a long time. Finally we capitalize the advantages of the former two methods and employ shortcuts to adiabatic passage (STAP) to generate the maximal entanglement. The strictly numerical simulation reveals that the current scheme is robust against spontaneous emission of atoms due to the virtual excitation of Rydberg states, and all of the above methods favor a high fidelity with the present experimental technology.
Highlights
Quantum entanglement, referring to the non-local and non-classical strong correlations between individual quantum objects, such as atoms, ions, superconducting circuits, spins, or photons, is one of the most distinct features in quantum mechanics and an important resource in quantum information and quantum metrology
As an attractive system for manipulation of quantum information, neutral atoms are similar to ions, the best developed system to date, due to their long-lived hyperfine states that are robust against decoherence, and they can be precisely manipulated by optical and other electromagnetic fields
When the neutral atoms are excited to the Rydberg states, it will exhibit large dipole moments resulting in a dipole-dipole interaction which is strong enough to shift the atomic energy levels and prevent more than one atom from being excited to the Rydberg state[14,15,16,17,18,19], which is related to Rydberg blockade phenomenon
Summary
20, ∆2 /Ω0 = 70, δ /Ω0 = 1, U = (∆2 − ∆1 + δ) governed by the ground state|gg〉 resonantly interacts with the ground state|ee〉 under original the condition of large detuning and there is nearly no population for the states |ge〉 or |eg〉. If the detuning (ν = δ + δ′ ≠ 0) is considered as shown in Eq (5), we can adiabatically eliminate the terms of|rr〉 state under the large detuning condition ν {Ωa, Ωb}, leading to the effective Hamiltonian. Compared with the former two methods, this STAP-based entanglement generation requires neither a long time nor an acurate interaction time
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