Multi-mode ultra-strong coupling in circuit quantum electrodynamics

Bosman, Sal J and Gely, Mario F and Singh, Vibhor and Bruno, Alessandro and Bothner, Daniel and Steele, Gary A (2017) Multi-mode ultra-strong coupling in circuit quantum electrodynamics. In: NPJ QUANTUM INFORMATION, 3 .

PDF NPJ_QUA_INF_3_46_2017.pdf - Published Version Restricted to Registered users only Download (2MB) | Request a copy

Abstract

With the introduction of superconducting circuits into the field of quantum optics, many experimental demonstrations of the quantum physics of an artificial atom coupled to a single-mode light field have been realized. Engineering such quantum systems offers the opportunity to explore extreme regimes of light-matter interaction that are inaccessible with natural systems. For instance the coupling strength g can be increased until it is comparable with the atomic or mode frequency omega(a,m) and the atom can be coupled to multiple modes which has always challenged our understanding of light-matter interaction. Here, we experimentally realize a transmon qubit in the ultra-strong coupling regime, reaching coupling ratios of g/omega(m) = 0.19 and we measure multi-mode interactions through a hybridization of the qubit up to the fifth mode of the resonator. This is enabled by a qubit with 88% of its capacitance formed by a vacuum-gap capacitance with the center conductor of a coplanar waveguide resonator. In addition to potential applications in quantum information technologies due to its small size, this architecture offers the potential to further explore the regime of multi-mode ultra-strong coupling.

Item Type:	Journal Article
Publication:	NPJ QUANTUM INFORMATION
Additional Information:	Copy right for this article belongs to the NATURE PUBLISHING GROUP, MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	17 Nov 2017 05:18
Last Modified:	17 Nov 2017 05:18
URI:	http://eprints.iisc.ac.in/id/eprint/58268

Actions (login required)

View Item