4.6 Article

Dipole-dipole-interaction-driven antiblockade of two Rydberg atoms

Journal

PHYSICAL REVIEW A
Volume 104, Issue 3, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.104.033716

Keywords

-

Funding

  1. Natural Science Foundation of Henan Province [202300410481]
  2. National Natural Science Foundation of China (NSFC) [11804308]
  3. China Postdoctoral Science Foundation (CPSF) [2018T110735]
  4. EPSRC [EP/R04340X/1]
  5. Royal Society [IEC\NSFC\181078]
  6. EPSRC [EP/R04340X/1] Funding Source: UKRI

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This study investigates the antiblockade dynamics of Rydberg atoms driven by dipole-dipole exchange interactions, demonstrating a method to realize geometric gates that are resistant to Rydberg state decay.
Resonant laser excitation of multiple Rydberg atoms are prohibited, leading to Rydberg blockade, when the long-range van der Waals interactions are stronger than the laser-atom coupling. Rydberg blockade can be violated, i.e., simultaneous excitation of more than one Rydberg atom, by off-resonant laser excitation, causing an excitation antiblockade. Rydberg antiblockade gives rise to strongly correlated many-body dynamics and spin-orbit coupling and also finds quantum computation applications. Instead of commonly used van der Waals interactions, we investigate antiblockade dynamics of two Rydberg atoms interacting via dipole-dipole exchange interactions. We study typical situations in current Rydberg atom experiments, where different types of dipole-dipole interactions can be achieved by varying Rydberg state couplings. An effective Hamiltonian governing underlying antiblockade dynamics is derived. We illustrate that geometric gates can be realized with the Rydberg antiblockade which is robust against the decay of Rydberg states. Our study may stimulate new experimental and theoretical exploration of quantum optics and strongly interacting many-body dynamics with Rydberg antiblockade driven by dipole-dipole interactions.

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