We stabilize the frequency of a diode laser operating near 1389.8 nm to an absorption line in water vapor. We measure the Allan deviation of the system to be 1.8 × 10 −10 at a 20-minute averaging time. The beatnote between two nearly identical systems deviates by <±1.6 MHz over 15.5 hours. The all-fiber optical setup may facilitate compact and alignment-free laser systems for field-deployable trapped ion quantum technology.

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Setup of a vibration-suppressed cryogenic system for a RF ion trap with minimum micromotion

Lukas J. Spieß

Jan 1, 20180 citations

Bulletin of the American Physical Society

System Stability Optimization and Gate Operations in a Compact Cryogenic Ion Trap Setup

Zhubing Jia, Robert Spivey, I. V. Inlek, Ke Sun, Stephen Crain, Mark C. Kuzyk, Rachel Noek, Kenneth R. Brown, Jungsang Kim

Published Jun 2, 2020• 0 citations

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Setup of a vibration-suppressed cryogenic system for a RF ion trap with minimum micromotion

Lukas J. Spieß

Recent advancements allow for sympathetic cooling of highly charged ions (HCI) to mK temperatures in a cryogenic linear Paul trap. This makes high precision spectroscopy of HCI possible, paving the way to the search for new physics and novel optical clocks. For this, a highly stable and well-understood Paul trap is required. In particular, excess micromotion needs to be characterized and reduced, since it can limit the lowest achievable ion temperature and therefore spectroscopic precision. Within this thesis, a new cryogenic supply system was partly assembled, which allows for vibrational decoupling of the trap, increasing storage stability. The first cool down test achieved a temperature of 4:23K in the trap environment, which is sufficiently low for superconductive operation of the intended RF-resonator made from niobium. Additionally, a photon-correlation technique was used on the existing cryogenic linear Paul trap using 9Be+ ions for determination of the trap frequency by measuring the phase shift between the driven ions motion and the driving field. From the trap frequency the magnification of the imaging system is deduced. The same photon-correlation technique is used to measure excess micromotion and to demonstrate its reduction by a factor of 100 compared to a previous measurement by using new electronics.Recent advancements allow for sympathetic cooling of highly charged ions (HCI) to mK temperatures in a cryogenic linear Paul trap. This makes high precision spectroscopy of HCI possible, paving the way to the search for new physics and novel optical clocks. For this, a highly stable and well-understood Paul trap is required. In particular, excess micromotion needs to be characterized and reduced, since it can limit the lowest achievable ion temperature and therefore spectroscopic precision. Within this thesis, a new cryogenic supply system was partly assembled, which allows for vibrational decoupling of the trap, increasing storage stability. The first cool down test achieved a temperature of 4:23K in the trap environment, which is sufficiently low for superconductive operation of the intended RF-resonator made from niobium. Additionally, a photon-correlation technique was used on the existing cryogenic linear Paul trap using 9Be+ ions for determination of the trap frequency by measuring the phase shift between the driven ions motion and the driving field. From the trap frequency the magnification of the imaging system is deduced. The same photon-correlation technique is used to measure excess micromotion and to demonstrate its reduction by a factor of 100 compared to a previous measurement by using new electronics.

Jan 1, 20180 citations

We demonstrate quantum control techniques for a single trapped ion in a cryogenic, surface-electrode trap. A narrow optical transition of

{\mathrm{Sr}}^{+}

along with the ground and first excited motional states of the harmonic trapping potential form a two-qubit system. The optical qubit transition is susceptible to magnetic field fluctuations, which we stabilize with a simple and compact method using superconducting rings. Decoherence of the motional qubit is suppressed by the cryogenic environment. ac Stark shift correction is accomplished by controlling the laser phase in the pulse sequencer, eliminating the need for an additional laser. Quantum process tomography is implemented on atomic and motional states by use of conditional pulse sequences. With these techniques, we demonstrate a Cirac-Zoller controlled-not gate in a single ion with a mean fidelity of

91(1)%