期刊
NEW JOURNAL OF PHYSICS
卷 21, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/ab0134
关键词
waveguide QED; subradiance; superradiance; superconducting qubits
资金
- IQIM postdoctoral fellowship
- Global Marie Curie Fellowship LANTERN
- Fannie and John Hertz Foundation
- Fundacio Privada Cellex
- Spanish MINECO Severo Ochoa Program [SEV-2015-0522]
- MINECO Plan Nacional Grant CANS
- CERCA Programme/Generalitat de Catalunya
- AGAUR Grant [2017 SGR 1334]
- ERC Starting Grant FOQAL
The properties of coupled emitters can differ dramatically from those of their individual constituents. Canonical examples include sub- and super-radiance, wherein the decay rate of a collective excitation is reduced or enhanced due to correlated interactions with the environment. Here, we systematically study the properties of collective excitations for regularly spaced arrays of quantum emitters coupled to a one-dimensional waveguide. We find that, for low excitation numbers, the modal properties are well-characterized by spin waves with a definite wavevector. Moreover, the decay rate of the most subradiant modes obeys a universal scaling with a cubic suppression in the number of emitters. Multi-excitation subradiant eigenstates can be built from fermionic combinations of single excitation eigenstates; such 'fermionization' results in multiple excitations that spatially repel one another. We put forward a method to efficiently create and measure such subradiant states, which can be realized with superconducting qubits. These measurement protocols probe both real-space correlations (using on-site dispersive readout) and temporal correlations in the emitted field (using photon correlation techniques).
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