Intermittent decoherence blockade in a chiral ring environment

Abstract

It has long been recognized that emission of radiation from atoms is not an intrinsic property of individual atoms themselves, but it is largely affected by the characteristics of the photonic environment and by the collective interaction among the atoms. A general belief is that preventing full decay and/or decoherence requires the existence of dark states, i.e., dressed light-atom states that do not decay despite the dissipative environment. Here, we show that, contrary to such a common wisdom, decoherence suppression can be intermittently achieved on a limited time scale, without the need for any dark state, when the atom is coupled to a chiral ring environment, leading to a highly non-exponential staircase decay. This effect, that we refer to as intermittent decoherence blockade, arises from periodic destructive interference between light emitted in the present and light emitted in the past, i.e., from delayed coherent quantum feedback.

Catch and release of propagating bosonic field with non-Markovian giant atom

“…The study of giant atoms with nonlocal light-matter interaction represents a new paradigm and research frontier in quantum optics [15][16][17][18]. The original theoretical framework [9,10] of giant atom(s) coupled to waveguide with linear dispersion relationship [19] has been extended to that of giant atom(s) interacting with structured environment, e.g.…”

Overcoming noise in quantum teleportation with multipartite hybrid entanglement

“…Avoiding any kind of decoherence is extremely demanding in practice, although many promising decoherence suppression protocols have been proposed. Some recent works have exploited delayed coherent quantum feedback (15)(16)(17), reservoir engineering with auxiliary subsystems (18)(19)(20), quantum error-correcting codes (21)(22)(23), dynamical decoupling (24)(25)(26), and decoherence-free subspaces (27,28).…”