Dr Christopher Ballance: Publications

Latest developments in the Sinara open hardware ecosystem

Institute of Electrical and Electronics Engineers (IEEE) 00 (2022) 799-802

Authors:

Paweł Kulik, Mikołaj Sowiński, Grzegorz Kasprowicz, David Allcock, Christopher Ballance, Sébastien Bourdeauducq, Joseph Britton, Michał Gąska, Thomas Harty, Jakub Jarosiński, Robert Jördens, Marcin Kiepiela, Norman Krackow, David Nadlinger, Krzysztof Poźniak, Tomasz Przywózki, Daniel Slichter, Filip Świtakowski, Marius Weber, Andrzej Wojciechowski, Weida Zhang

A quantum network of entangled optical atomic clocks

(2021)

Authors:

BC Nichol, R Srinivas, DP Nadlinger, P Drmota, D Main, G Araneda, CJ Ballance, DM Lucas

Experimental quantum key distribution certified by Bell's theorem

(2021)

Authors:

DP Nadlinger, P Drmota, BC Nichol, G Araneda, D Main, R Srinivas, DM Lucas, CJ Ballance, K Ivanov, EY-Z Tan, P Sekatski, RL Urbanke, R Renner, N Sangouard, J-D Bancal

Micromotion minimisation by synchronous detection of parametrically excited motion

(2021)

Authors:

DP Nadlinger, P Drmota, D Main, BC Nichol, G Araneda, R Srinivas, LJ Stephenson, CJ Ballance, DM Lucas

Benchmarking a high-fidelity mixed-species entangling gate

Physical Review Letters American Physical Society 125:8 (2020) 080504

Authors:

Amy Hughes, Vera Schäfer, Keshav Thirumalai, David Nadlinger, Sarah Woodrow, David Lucas, Christopher Ballance

Abstract:

We implement a two-qubit logic gate between a 43Ca+ hyperfine qubit and a 88Sr+ Zeeman qubit. For this pair of ion species, the S–P optical transitions are close enough that a single laser of wavelength 402 nm can be used to drive the gate but sufficiently well separated to give good spectral isolation and low photon scattering errors. We characterize the gate by full randomized benchmarking, gate set tomography, and Bell state analysis. The latter method gives a fidelity of 99.8(1)%, comparable to that of the best same-species gates and consistent with known sources of error.

51��