ALP Seminar: Distributed Quantum Computing across a Trapped-Ion Quantum Network

18 Nov 2024
Seminars and colloquia
Time
Venue
Simpkins Lee Seminar Room
Beecroft Building, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU
Speaker(s)

Mr Dougal Main, University of Oxford

Seminar series
ALP seminar
For more information contact

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 connectivity [1]. 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 connectivity via quantum gate teleportation (QGT) [2,3]. For a scalable DQC architecture, the QGT implementation must be deterministic and repeatable; until now, no demonstration has satisfied these requirements.

In this talk, I will present our recent experimental demonstration of distributed quantum computing between two photonically interconnected trapped-ion modules [4]. Using heralded remote entanglement shared between two 88Sr+ ions in separate modules, we deterministically teleport a controlled-Z gate between two 43Ca+ qubits across the quantum network. Furthermore, we construct distributed quantum circuits compiled with multiple non-local two-qubit gates, including the SWAP gate, the iSWAP gate, and the implementation of Grover’s algorithm.
 

  1. J. I. Cirac, A. K. Ekert, S. F. Huelga, and C. Macchiavello, Distributed quantum computation over noisy channels. Phys. Rev. A 59, 4249 (1999).
     
  2. L. Jiang, J. M. Taylor, A. S. Sørensen, and M. D. Lukin, Distributed quantum computation based on small quantum registers. Phys. Rev. A 76, 062323 (2007).
     
  3. C. Monroe, et al., Large-scale modular quantum computer architecture with atomic memory and photonic interconnects. Phys. Rev. A 89, 022317 (2014). 
     
  4. D. Main et al., Distributed Quantum Computing across an Optical Network Link. Preprint at https://arxiv.org/abs/2407.00835.