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DOI number:10.1103/PhysRevA.102.011301

Journal:PHYSICAL REVIEW A

Abstract:In this Rapid Communication, we propose a protocol to reverse a quantum many-body dynamic process. We name it “many-body echo” because the underlying physics is closely related to the spin echo effect in nuclear magnetic resonance systems. We consider a periodical modulation of the interaction strength in a weakly interacting Bose condensate, which resonantly excites quasiparticles from the condensate. A dramatic phenomenon is that, after pausing the interaction modulation for half a period and then continuing on with the same modulation, nearly all the excited quasiparticles in the resonance modes will be absorbed back into the condensate. During the intermediate half-period, the free evolution introduces a π phase, which plays a role reminiscent of that played by the π pulse in the spin echo. Comparing our protocol with another one implemented by the Chicago group in a recent experiment, we find that ours is more effective at reversing the many-body process. The difference between these two schemes manifests the physical effect of the micromotion in the Floquet theory.

Translation or Not:no

Included Journals:SCI

Links to published journals:https://journals.aps.org/pra/abstract/10.1103/PhysRevA.102.011301