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Atomic and Laser Physics
Credit: Jack Hobhouse

Dr Fabian Pokorny

Visitor

Research theme

  • Quantum information and computation

Sub department

  • Atomic and Laser Physics

Research groups

  • Ion trap quantum computing
fabian.pokorny@physics.ox.ac.uk
  • About
  • Publications

Utility of virtual qubits in trapped-ion quantum computers

ArXiv 2406.19332 (2024)

Authors:

Saumya Shivam, Fabian Pokorny, Andres Vazquez-Brennan, Ana S Sotirova, Jamie D Leppard, Sophie M Decoppet, CJ Ballance, SL Sondhi
Details from ArXiV

Low Cross-Talk Optical Addressing of Trapped-Ion Qubits Using a Novel Integrated Photonic Chip

(2023)

Authors:

AS Sotirova, B Sun, JD Leppard, A Wang, M Wang, A Vazquez-Brennan, DP Nadlinger, S Moser, A Jesacher, C He, F Pokorny, MJ Booth, CJ Ballance
More details from the publisher
Details from ArXiV

Magic trapping of a Rydberg ion with a diminished static polarizability

ArXiv 2005.12422 (2020)

Authors:

Fabian Pokorny, Chi Zhang, Gerard Higgins, Markus Hennrich
Details from ArXiV

Observation of effects due to an atom's electric quadrupole polarizability

ArXiv 2005.01957 (2020)

Authors:

Gerard Higgins, Chi Zhang, Fabian Pokorny, Harry Parke, Erik Jansson, Shalina Salim, Markus Hennrich
Details from ArXiV

Submicrosecond entangling gate between trapped ions via Rydberg interaction.

Nature 580:7803 (2020) 345-349

Authors:

Chi Zhang, Fabian Pokorny, Weibin Li, Gerard Higgins, Andreas Pöschl, Igor Lesanovsky, Markus Hennrich

Abstract:

Generating quantum entanglement in large systems on timescales much shorter than the coherence time is key to powerful quantum simulation and computation. Trapped ions are among the most accurately controlled and best isolated quantum systems1 with low-error entanglement gates operated within tens of microseconds using the vibrational motion of few-ion crystals2,3. To exceed the level of complexity tractable by classical computers the main challenge is to realize fast entanglement operations in crystals made up of many ions (large ion crystals)4. The strong dipole-dipole interactions in polar molecule5 and Rydberg atom6,7 systems allow much faster entangling gates, yet stable state-independent confinement comparable with trapped ions needs to be demonstrated in these systems8. Here we combine the benefits of these approaches: we report a two-ion entangling gate with 700-nanosecond gate time that uses the strong dipolar interaction between trapped Rydberg ions, which we use to produce a Bell state with 78 per cent fidelity. The sources of gate error are identified and a total error of less than 0.2 per cent is predicted for experimentally achievable parameters. Furthermore, we predict that residual coupling to motional modes contributes an approximate gate error of 10-4 in a large ion crystal of 100 ions. This provides a way to speed up and scale up trapped-ion quantum computers and simulators substantially.
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