High-fidelity two-qubit quantum logic gates using trapped calcium-43 ions

2014/06/20 by C. J. Ballance, T. P. Harty, N. M. Linke +2 · 2 citations
Physics and Astronomy · #physics.atom-ph #quant-ph

paper · pdf · doi:10.1103/physrevlett.117.060504

published as Phys. Rev. Lett. 117, 060504 (2016) · Preliminary report; more details to be given in a future version. 1 trap, 2 ions, 3 nines

arxiv created 2014/06/20 · arxiv updated 2016/08/10

Abstract

We study the speed/fidelity trade-off for a two-qubit phase gate implemented in ⁴³Ca⁺ hyperfine trapped-ion qubits. We characterize various error sources contributing to the measured fidelity, allowing us to account for errors due to single-qubit state preparation, rotation and measurement (each at the ∼0.1% level), and to identify the leading sources of error in the two-qubit entangling operation. We achieve gate fidelities ranging between 97.1(2)% (for a gate time t_g=3.8μs) and 99.9(1)% (for t_g=100μs), representing respectively the fastest and lowest-error two-qubit gates reported between trapped-ion qubits by nearly an order of magnitude in each case.

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