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Single-qubit-gate error below 10-4 in a trapped ion



Kenton R. Brown, Andrew C. Wilson, Yves Colombe, Christian Ospeklaus, Adam M. Meier, Emanuel H. Knill, Dietrich G. Leibfried, David J. Wineland


In theory, quantum computers can solve certain problems much more efficiently than classical computers [1]. This has motivated experimental efforts to construct and verify devices that manipulate quantum bits (qubits) in a variety of physical systems [2]. The power of quantum computers depends on the ability to accurately control sensitive superposition amplitudes by means of quantum gates, and errors in these gates are one of the chief obstacles to building quantum computers. Here we establish an error probability per randomized one-qubit gate of 2.0(2) × 10-5, well below the threshold estimate of 10-4 commonly considered sufficient for fault-tolerant quantum computing [3, 4]. The qubit is realized with two hyperfine ground states of a 9Be+ ion trapped above a microfabricated surface-electrode ion trap [5, 6] and manipulated with microwaves applied to the trap electrodes [7]. This demonstration of errors significantly below the threshold is an essential step toward construction of a scalable quantum computer.
Physical Review A


atom, ion, quantum gate, quantum computer, gate error, qubit, benchmark, fault-tolerant


Brown, K. , Wilson, A. , Colombe, Y. , Ospeklaus, C. , Meier, A. , Knill, E. , Leibfried, D. and Wineland, D. (2011), Single-qubit-gate error below 10<sup>-4</sup> in a trapped ion, Physical Review A, [online], (Accessed May 21, 2024)


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Created September 14, 2011, Updated February 19, 2017