Ground-state cooling of a trapped ion Using long-wavelength radiation

Weidt, S, Randall, J, Webster, S C, Standing, E D, Rodriguez, A, Webb, A E, Lekitsch, B and Hensinger, W K (2015) Ground-state cooling of a trapped ion Using long-wavelength radiation. Physical Review Letters, 115 (1). ISSN 0031-9007

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We demonstrate ground-state cooling of a trapped ion using radio-frequency (rf) radiation. This is a powerful tool for the implementation of quantum operations, where rf or microwave radiation instead of lasers is used for motional quantum state engineering. We measure a mean phonon number of n¯=0.13(4) after sideband cooling, corresponding to a ground-state occupation probability of 88(7)%. After preparing in the vibrational ground state, we demonstrate motional state engineering by driving Rabi oscillations between the |n=0⟩ and |n=1⟩ Fock states. We also use the ability to ground-state cool to accurately measure the motional heating rate and report a reduction by almost 2 orders of magnitude compared with our previously measured result, which we attribute to carefully eliminating sources of electrical noise in the system.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Winfried Hensinger
Date Deposited: 11 Aug 2015 13:38
Last Modified: 17 Jan 2018 12:05

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Project NameSussex Project NumberFunderFunder Ref
Quantum technology with nanofabricated ion trap chipsG0308EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCILEP/G007276/1
Ion trap arrays for scalable quantum computing.G0294EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCILEP/E011136/1