Coherent excitation transport through ring-shaped networks

Year: 2024

Authors: Perciavalle F., Morsch O., Rossini D., Amico L.

Autors Affiliation: Technol Innovat Inst, Quantum Res Ctr, POB 9639, Abu Dhabi, U Arab Emirates; Univ Pisa, Dipartimento Fis, Largo Pontecorvo 3, I-56127 Pisa, Italy; INFN, Largo Pontecorvo 3, I-56127 Pisa, Italy; CNR INO, Largo Pontecorvo 3, I-56127 Pisa, Italy; Univ Pisa, Dipartimento Fis, Largo Pontecorvo 3, I-56127 Pisa, Italy; Univ Catania, Dipartimento Fis & Astron Ettore Majorana, Via S Sofia 64, I-95123 Catania, Italy; INFN, Sez Catania, Via S Sofia 64, I-95123 Catania, Italy.

Abstract: The coherent quantum transport of matter wave through a ring-shaped circuit attached to leads defines an iconic system in mesoscopic physics that has allowed researchers to both explore fundamental questions in quantum science and to draw important avenues for conceiving devices of practical use. Here we study the source-to-drain transport of excitations going through a ring network, without propagation of matter waves. We model the circuit in terms of a spin system with specific long-range interactions that are relevant for quantum technology, such as Rydberg atoms trapped in optical tweezers or ion traps. Inspired by the logic of rf- and dc-SQUIDs, we consider rings with one and two local energy offsets, or detunings. As a combination of specific phase shifts in going through the localized detunings and as a result of coherent tunneling, we demonstrate how the transport of excitations can be controlled, with a distinctive dependence on the range of interactions.

Journal/Review: PHYSICAL REVIEW A

Volume: 109 (6)      Pages from: 62619-1  to: 62619-18

More Information: We thank Giampiero Marchegiani and Tobias Haug for useful discussions. The Julian Schwinger Foundation Grant No. JSF-18-12-0011 is acknowledged. O.M. also acknowledges support by the H2020 ITN MOQS (Grant Agreement No. 955479) and MUR (Ministero dell’Universita e della Ricerca) through the PNRR MUR Project No. PE0000023- NQSTI.
KeyWords: Quantum Oscillations; Dynamics; Propagation; Hundreds
DOI: 10.1103/PhysRevA.109.062619