The ability to achieve strong-coupling has made cavity-magnon systems an exciting platform for the development of hybrid quantum systems and the investigation of fundamental problems in physics. Unfortunately, current experimental realizations are constrained to operate at a single frequency, defined by the geometry of the microwave cavity. In this article we realize a highly-tunable, cryogenic, microwave cavity strongly coupled to magnetic spins. The cavity can be tuned in situ by up to 1.5 GHz, approximately 15% of its original 10 GHz resonance frequency. Moreover, this system remains within the strong-coupling regime at all frequencies with a cooperativity of ≈ 800.
We report on the development of on-chip microcavities and show their potential as a platform for cavity quantum electrodynamics experiments. Microcavity arrays were formed by the controlled buckling of SiO2/Ta2O5 Bragg mirrors, and exhibit a reflectance-limited finesse of 3500 and mode volumes as small as 35λ3 . We show that the cavity resonance can be thermally tuned into alignment with the D2 transition of 87 Rb, and outline two methods for providing atom access to the cavity. Owing to their small mode volume and high finesse, these cavities exhibit single-atom cooperativities as high as C1 = 65. A unique feature of the buckled-dome architecture is that the strong-coupling parameter g0/κ is nearly independent of the cavity size. Furthermore, strong coupling should be achievable with only modest improvements in mirror reflectance, suggesting that these monolithic devices could provide a robust and scalable solution to the engineering of light-matter interfaces.The implementation of a distributed quantum network could enable a global quantum communication system, [1,2] operations, [7,28] and to implement an elementary quantum network.[29] These works place single-atom quantum systems as a leading candidate for use in large-scale quantum networks. As a result, there is a strong interest in the integration of alkali atoms into robust, scalable, packaged optical cavities. [30,31] Furthermore, it is desirable for these optical cavities to have small mode volumes and be tunable to atomic transitions. [32][33][34] Here we report the development of 'buckled-dome' Fabry-Pérot microcavities designed for cQED applications, specifically on-chip coupling between single photons and single rubidium atoms. These cavities produce high single-atom cooperativities, can be easily tuned to atomic transitions, and can facilitate open-access for incorporation of atoms.The buckled-dome microcavities were fabricated via a monolithic self-assembly procedure. [35,36] First, a distributed Bragg reflector (10.5 periods SiO 2 /Ta 2 O 5 , starting and ending with Ta 2 O 5 ) was deposited on a fused silica substrate by reactive magnetron sputtering. Microcavities were defined by the lithographic patterning of a thin (∼15 nm) low-adhesion fluorocarbon layer, followed by the deposition of a second Bragg reflector identical to the initial reflector. Films with low loss and high compressive stress (∼200 MPa) were realized by using high target power (200 W), elevated substrate temperature (150• C), and low chamber pressure (4 mTorr).[37] Optical constants for single films were measured usarXiv:1601.03344v1 [cond-mat.mes-hall]
Atomic vapors offer many opportunities for manipulating electromagnetic signals across a broad range of the electromagnetic spectrum. Here, a microwave signal with an audio-frequency modulation encodes information in an optical signal by exploiting an atomic microwave-to-optical double resonance, and magnetic-field coupling that is amplified by a resonant high-Q microwave cavity. Using this approach, audio signals are encoded as amplitude or frequency modulations in a GHz carrier, transmitted through a cable or over free space, demodulated through cavity-enhanced atom-microwave interactions, and finally, optically detected to extract the original information. This atom-cavity signal transduction technique provides a powerful means by which to transfer information between microwave and optical fields, all using a relatively simple experimental setup without active electronics.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.