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Single trapped ion

Single trapped ion

Credit: David Nadlinger

David Lucas

Professor of Physics

Sub department

  • Atomic and Laser Physics

Research groups

  • Ion trap quantum computing
David.Lucas@physics.ox.ac.uk
Telephone: 01865 (2)72384,01865 (2)72346
Clarendon Laboratory, room -170,-172,-171,316.6
  • About
  • Publications

Single-Qubit Gates with Errors at the 10-7 Level

Physical Review Letters American Physical Society (APS) 134:23 (2025) 230601

Authors:

MC Smith, AD Leu, K Miyanishi, MF Gely, DM Lucas
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Distributed quantum computing across an optical network link

Nature Nature Research 638:8050 (2025) 383-388

Authors:

D Main, P Drmota, DP Nadlinger, EM Ainley, A Agrawal, BC Nichol, R Srinivas, G Araneda, DM Lucas

Abstract:

Distributed quantum computing (DQC) combines the computing power of multiple networked quantum processing modules, ideally enabling the execution of large quantum circuits without compromising performance or qubit connectivity1, 2. Photonic networks are well suited as a versatile and reconfigurable interconnect layer for DQC; remote entanglement shared between matter qubits across the network enables all-to-all logical connectivity through quantum gate teleportation (QGT)3, 4. For a scalable DQC architecture, the QGT implementation must be deterministic and repeatable; until now, no demonstration has satisfied these requirements. Here we experimentally demonstrate the distribution of quantum computations between two photonically interconnected trapped-ion modules. The modules, separated by about two metres, each contain dedicated network and circuit qubits. By using heralded remote entanglement between the network qubits, we deterministically teleport a controlled-Z (CZ) gate between two circuit qubits in separate modules, achieving 86% fidelity. We then execute Grover’s search algorithm5—to our knowledge, the first implementation of a distributed quantum algorithm comprising several non-local two-qubit gates—and measure a 71% success rate. Furthermore, we implement distributed iSWAP and SWAP circuits, compiled with two and three instances of QGT, respectively, demonstrating the ability to distribute arbitrary two-qubit operations6. As photons can be interfaced with a variety of systems, the versatile DQC architecture demonstrated here provides a viable pathway towards large-scale quantum computing for a range of physical platforms.
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Single-qubit gates with errors at the $10^{-7}$ level

(2024)

Authors:

MC Smith, AD Leu, K Miyanishi, MF Gely, DM Lucas
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Polarization-insensitive state preparation for trapped-ion hyperfine qubits

Physical Review A American Physical Society (APS) 110:4 (2024) l040402

Authors:

AD Leu, MC Smith, MF Gely, DM Lucas
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Generating arbitrary superpositions of nonclassical quantum harmonic oscillator states

(2024)

Authors:

S Saner, O Băzăvan, DJ Webb, G Araneda, DM Lucas, CJ Ballance, R Srinivas
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