Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session N41: Noise Characterization, Mitigation and Engineering in Superconducting Qubits
11:30 AM–2:30 PM,
Wednesday, March 16, 2022
Room: McCormick Place W-196C
Sponsoring
Units:
DQI DCMP
Chair: Matthew McEwen, UCSB
Abstract: N41.00012 : Composite bosons in transmon arrays: a perturbative approach
2:06 PM–2:18 PM
Presenter:
Sami Laine
(Univ of Oulu)
Authors:
Sami Laine
(Univ of Oulu)
Olli Mansikkamäki
(Univ of Oulu)
Atte Piltonen
(Univ of Oulu)
Matti Silveri
(Univ of Oulu)
Here, we study the model perturbatively in the limit of weak hopping, where it is possible to bind multiple bosons together simply by stacking them onto the same site. These composite bosons can be viewed as quasiparticles since they behave much like the bare bosons, although with some crucial differences. First, they are more massive, and the observed dynamics occurs at longer time scales. Second, even if the sites are all identical, boundary effects create an effective energy landscape for the quasiparticles, either keeping them trapped near a boundary or preventing them from getting close to a one. Finally, although the actual bosons can only interact when they are at the same site, the interactions between the quasiparticles can be of longer range, and either attractive or repulsive. For example, if two quasiparticles are placed near one another, they may form a bound state, but when approaching each other from a distance, they may scatter without actually colliding.
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