Measuring Anomalous Heating in a Planar Ion Trap with Variable Ion-Surface Separation.

  title={Measuring Anomalous Heating in a Planar Ion Trap with Variable Ion-Surface Separation.},
  author={Ivan A. Boldin and Alexander Kraft and Christof Wunderlich},
  journal={Physical review letters},
  volume={120 2},
Cold ions trapped in the vicinity of conductive surfaces experience heating of their oscillatory motion. Typically, the rate of this heating is orders of magnitude larger than expected from electric field fluctuations due to thermal motion of electrons in the conductors. This effect, known as anomalous heating, is not fully understood. One of the open questions is the heating rate's dependence on the ion-electrode separation. We present a direct measurement of this dependence in an ion trap of… 

Figures from this paper

Distance scaling of electric-field noise in a surface-electrode ion trap

We investigate anomalous ion-motional heating, a limitation to multi-qubit quantum-logic gate fidelity in trapped-ion systems, as a function of ion-electrode separation. Using a multi-zone

van der Waals-corrected density functional study of electric field noise heating in ion traps caused by electrode surface adsorbates

In order to realize the full potential of ion trap quantum computers, an improved understanding is required of the motional heating that trapped ions experience. Experimental studies of the

Motional heating of spatially extended ion crystals

We study heating of motional modes of a single ion and of extended ion crystals trapped in a linear radio frequency (rf) Paul trap with a precision of Δn̄̇≈0.1 phonons s−1. Single-ion axial and

Measuring the temperature and heating rate of a single ion by imaging

We present a technique based on high resolution imaging to measure the absolute temperature and the heating rate of a single ion trapped at the focus of a deep parabolic mirror. We collect the

Evidence for multiple mechanisms underlying surface electric-field noise in ion traps

Electric-field noise from ion-trap electrode surfaces can limit the fidelity of multiqubit entangling operations in trapped-ion quantum information processors and can give rise to systematic errors

Electric-field noise from thermally activated fluctuators in a surface ion trap

We probe electric-field noise near the metal surface of an ion-trap chip in the temperature range from 295 to 530 K. We observe a nontrivial temperature dependence with the noise amplitude at 1 MHz

Observation of superconductivity and surface noise using a single trapped ion as a field probe

Measuring and understanding electric field noise from bulk material and surfaces is important for many areas of physics. In this work, we introduce a method to detect in situ different sources of

Distance scaling and polarization of electric-field noise in a surface ion trap

We probe electric-field noise in a surface ion trap for ion-surface distances $d$ between 50 and 300 \textmu{}m in the normal and planar directions. We find the noise distance dependence to scale as

Absolute single-ion thermometry

We describe and experimentally implement a single-ion local thermometry technique with absolute sensitivity adaptable to all laser-cooled atomic ion species. The technique is based on the

Surface trap with dc-tunable ion-electrode distance.

A novel surface-electrode Paul trap that produces a radio-frequency-null along the axis perpendicular to the trap surface is described that provides a platform for precision electric-field noise detection and trapping of vertical ion strings without excess micromotion and may have applications for scalable quantum computers with surface ion traps.



Measurements of trapped-ion heating rates with exchangeable surfaces in close proximity

Electric-field noise from the surfaces of ion-trap electrodes couples to the ion's charge causing heating of the ion's motional modes. This heating limits the fidelity of quantum gates implemented in

Simplified motional heating rate measurements of trapped ions

We have measured motional heating rates of trapped atomic ions, a factor that can influence multi-ion quantum logic gate fidelities. Two simplified techniques were developed for this purpose: one

Scaling and suppression of anomalous heating in ion traps.

The scaling of heating with electrode proximity is measured, and when the electrodes are cooled from 300 to 150 K, the heating rate is suppressed by an order of magnitude, providing direct evidence that anomalous motional heating of trapped ions stems from microscopic noisy potentials on the electrodes that are thermally driven.

Finite-geometry models of electric field noise from patch potentials in ion traps

We model electric field noise from fluctuating patch potentials on conducting surfaces by taking into account the finite geometry of the ion trap electrodes to gain insight into the origin of

Ion-trap measurements of electric-field noise near surfaces

Electric-field noise near surfaces is a common problem in diverse areas of physics, and a limiting factor for many precision measurements. There are multiple mechanisms by which such noise is

Reduction of heating rate in a microfabricated ion trap by pulsed-laser cleaning

Laser cleaning of the electrodes in a planar micro-fabricated ion trap has been attempted using ns pulses from a tripled Nd:YAG laser at 355 nm. The effect of the laser pulses at several energy

Fluorescence during Doppler cooling of a single trapped atom

We investigate the temporal dynamics of Doppler cooling of an initially hot single trapped atom in the weak-binding regime using a semiclassical approach. We develop an analytical model for the

Bright source of cold ions for surface-electrode traps

We produce large numbers of low-energy ions by photoionization of laser-cooled atoms inside a surface-electrode-based Paul trap. The isotope-selective trap's loading rate of 4x10{sup 5} Yb{sup +}

Surface noise analysis using a single-ion sensor

We use a single-ion electric-field noise sensor in combination with in situ surface treatment and analysis tools, to investigate the relationship between electric-field noise from metal surfaces in

Sub-millikelvin spatial thermometry of a single Doppler-cooled ion in a Paul trap

We report on observations of thermal motion of a single, Doppler-cooled ion along the axis of a linear radio-frequency quadrupole trap. We show that for a harmonic potential the thermal occupation of