Strong coupling of a single ion to an optical cavity

Takahashi, Hiroki, Kassa, Ezra, Christoforou, Costas and Keller, Matthias (2020) Strong coupling of a single ion to an optical cavity. Physical Review Letters (PRL), 124 (1). a013602. ISSN 0031-9007

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Strong coupling between an atom and an electromagnetic resonator is an important condition in cavity quantum electrodynamics (CQED). While strong coupling in various physical systems has been achieved so far, it remained elusive for single atomic ions. Here we achieve a coupling strength of 2pix(12.3+/-0.1)MHz between a single 40Ca+ ion and an optical cavity, exceeding both atomic and cavity decay rates which are 2pix11.5 and 2pix(4.1+/-0.1)MHz respectively. We use cavity assisted Raman spectroscopy to precisely characterize the ion-cavity coupling strength and observe a spectrum featuring the normal mode splitting in the cavity transmission due to the ion-cavity interaction. Our work paves the way towards new applications of CQED utilizing single trapped ions in the strong coupling regime for quantum optics and quantum technologies.

Item Type: Article
Keywords: Quantum technology, Cavity-QED, Quantum networks
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Sussex Centre for Quantum Technologies
Subjects: Q Science > QC Physics > QC0170 Atomic physics. Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics > QC0174.12 Quantum theory. Quantum mechanics
Depositing User: Matthias Keller
Date Deposited: 04 Dec 2019 09:32
Last Modified: 03 Jan 2020 13:45

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Project NameSussex Project NumberFunderFunder Ref
UK Quantum Technology Hub: NQIT-Networked Quantum Information TechnologiesG1503EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCILEP/M013243/1