Giant atoms are a new paradigm of quantum optics going beyond the usual local coupling. Building on this, a new type of decoherence-free (DF) many-body Hamiltonians was shown in a broadband waveguide. Here these are incorporated in a general framework (not relying on master equations) and contrasted to dispersive DF Hamiltonians with normal atoms: the two schemes are shown to correspond to qualitatively different ways to match the same general condition for suppressing decoherence. Next, we map the giant atoms dynamics into a cascaded collision model (CM), providing an intuitive interpretation of the connection between nontrivial DF Hamiltonians and coupling points topology. The braided configuration is shown to implement a scheme where a shuttling system subject to periodic phase kicks mediates a DF coupling between the atoms. From the viewpoint of CMs theory, this shows a collision model where ancillas effectively implement a dissipationless, maximally entangling two-qubit gate on the system.

Carollo, A., Cilluffo, D., & Ciccarello, F. (2020). Mechanism of decoherence-free coupling between giant atoms. PHYSICAL REVIEW RESEARCH, 2(4) [10.1103/PhysRevResearch.2.043184].

Mechanism of decoherence-free coupling between giant atoms

Carollo, Angelo
;
Cilluffo, Dario;Ciccarello, Francesco
2020

Abstract

Giant atoms are a new paradigm of quantum optics going beyond the usual local coupling. Building on this, a new type of decoherence-free (DF) many-body Hamiltonians was shown in a broadband waveguide. Here these are incorporated in a general framework (not relying on master equations) and contrasted to dispersive DF Hamiltonians with normal atoms: the two schemes are shown to correspond to qualitatively different ways to match the same general condition for suppressing decoherence. Next, we map the giant atoms dynamics into a cascaded collision model (CM), providing an intuitive interpretation of the connection between nontrivial DF Hamiltonians and coupling points topology. The braided configuration is shown to implement a scheme where a shuttling system subject to periodic phase kicks mediates a DF coupling between the atoms. From the viewpoint of CMs theory, this shows a collision model where ancillas effectively implement a dissipationless, maximally entangling two-qubit gate on the system.
Carollo, A., Cilluffo, D., & Ciccarello, F. (2020). Mechanism of decoherence-free coupling between giant atoms. PHYSICAL REVIEW RESEARCH, 2(4) [10.1103/PhysRevResearch.2.043184].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/480802
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