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C. J. Ballance
Researcher at University of Oxford
Publications - 56
Citations - 2613
C. J. Ballance is an academic researcher from University of Oxford. The author has contributed to research in topics: Qubit & Ion trap. The author has an hindex of 18, co-authored 42 publications receiving 1990 citations.
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Journal ArticleDOI
High-Fidelity Quantum Logic Gates Using Trapped-Ion Hyperfine Qubits.
TL;DR: Laser-driven two-qubit and single-qu bit logic gates with respective fidelities 99.9(1)% and 99.9934(3)%, significantly above the ≈99% minimum threshold level required for fault-tolerant quantum computation are demonstrated.
Journal ArticleDOI
High-Fidelity Preparation, Gates, Memory, and Readout of a Trapped-Ion Quantum Bit.
T. P. Harty,David Allcock,C. J. Ballance,L Guidoni,H. A. Janacek,Norbert M. Linke,D. N. Stacey,D. M. Lucas +7 more
TL;DR: All single-qubit operations with fidelities significantly above the minimum threshold required for fault-tolerant quantum computing are implemented, using a trapped-ion qubit stored in hyperfine "atomic clock" states of ^{43}Ca^{+}.
Journal ArticleDOI
Fast quantum logic gates with trapped-ion qubits.
V. M. Schäfer,C. J. Ballance,K. Thirumalai,L. J. Stephenson,T. G. Ballance,Andrew M. Steane,D. M. Lucas +6 more
TL;DR: This work demonstrates entanglement generation for gate times as short as 480 nanoseconds—less than a single oscillation period of an ion in the trap and eight orders of magnitude shorter than the memory coherence time measured in similar calcium-43 hyperfine qubits.
Journal ArticleDOI
High-Fidelity Trapped-Ion Quantum Logic Using Near-Field Microwaves
TL;DR: A dynamically decoupled gate method, which stabilizes the qubits against fluctuating energy shifts and avoids the need to null the microwave field, is introduced and used to produce a Bell state with fidelity 99.7(1)%, after accounting for state preparation and measurement errors.
Journal ArticleDOI
High-Rate, High-Fidelity Entanglement of Qubits Across an Elementary Quantum Network.
L. J. Stephenson,D. P. Nadlinger,B. C. Nichol,Shuoming An,P. Drmota,T. G. Ballance,K. Thirumalai,J. F. Goodwin,D. M. Lucas,C. J. Ballance +9 more
TL;DR: It is demonstrated that a novel geometry allows high-efficiency photon collection while maintaining unit fidelity for ion-photon entanglement and generates heralded Bell pairs with fidelity 94% at an average rate 182 s^{-1}.