# Efficient sympathetic cooling in mixed barium and ytterbium ion chains

@article{Sakrejda2021EfficientSC, title={Efficient sympathetic cooling in mixed barium and ytterbium ion chains}, author={Tomasz Sakrejda and Liudmila A. Zhukas and Boris B. Blinov}, journal={Quantum Inf. Process.}, year={2021}, volume={20}, pages={1-10} }

We Doppler cool barium ions in mixed barium-ytterbium chains confined in a linear RF trap and measure the motional average occupation quantum numbers of all radial normal modes. The full set of orderings in a chain of two barium and two ytterbium ions have been probed, and we show that the average thermal occupation number for all chain configurations strongly depends on the trap aspect ratio. We demonstrate efficient sympathetic cooling of all radial normal modes for the trap aspect ratio of 2…

## References

SHOWING 1-10 OF 28 REFERENCES

Sympathetic ground-state cooling and coherent manipulation with two-ion crystals

- Physics
- 2001

We have cooled a two-ion crystal to the ground-state of its collective modes of motion. Laser cooling, more specifically resolved sideband cooling, is performed sympathetically by illuminating only…

Trapped Ion Chain Thermometry and Mass Spectrometry through Imaging

- PhysicsEuropean journal of mass spectrometry
- 2016

We demonstrate a spatial-imaging thermometry technique for ions in a one-dimensional Coulomb crystal by relating their imaged spatial extent along the linear radiofrequency ion trap axis to normal…

Toward a scalable quantum computing architecture with mixed species ion chains

- PhysicsQuantum Inf. Process.
- 2016

Generation of ion–photon entanglement with barium ions with a fidelity of 0.84 is discussed, which is an initial step towards remote ion–ion coupling in a more scalable quantum information architecture.

Large-Scale Quantum Computation in an Anharmonic Linear Ion Trap

- Physics
- 2009

We propose a large-scale quantum computer architecture by more easily stabilizing a single large linear ion chain in a very simple trap geometry. By confining ions in an anharmonic linear trap with…

Trapped ion scaling with pulsed fast gates

- Physics
- 2015

Fast entangling gates for trapped ions offer vastly improved gate operation times relative to implemented gates, as well as approaches to trap scaling. Gates on neighbouring ions only involve local…

Single-qubit quantum memory exceeding ten-minute coherence time

- Physics
- 2017

A long-time quantum memory capable of storing and measuring quantum information at the single-qubit level is an essential ingredient for practical quantum computation and communication1,2. Currently,…

Quantum computing with trapped ions

- PhysicsEQEC '05. European Quantum Electronics Conference, 2005.
- 2005

Modular entanglement of atomic qubits using photons and phonons

- Physics
- 2015

Many quantum protocols require fast, remote entanglement generation to outperform their classical counterparts. A modular solution is now reported, using trapped ions that are remotely entangled…

Entanglement of single-atom quantum bits at a distance

- PhysicsNature
- 2007

The entanglement of two fixed single-atom quantum memories separated by one metre is demonstrated by directly measuring qubit correlations with near-perfect detection efficiency, and is still in principle useful for subsequent quantum operations and scalable quantum information applications.