Entangling an arbitrary pair of qubits in a long ion crystal

Pak Hong Leung and Kenneth R. Brown
Phys. Rev. A 98, 032318 – Published 18 September 2018

Abstract

It is well established that the collective motion of ion crystals can be used as a quantum bus for multiqubit entanglement. However, as the number of ions increases, it becomes difficult to directly entangle ions far apart and resolve all motional modes of the ion crystal. We introduce a scalable and flexible scheme for efficient entanglement between any pair of ions within a large ion chain, using an evenly distributed 50-ion crystal as an example. By performing amplitude and frequency modulation, we find high-fidelity pulse sequences that primarily drive a transverse motional mode with a wavelength of four ion spacings. We present two 500μs pulses that can in theory suppress gate errors due to residual motion to below 104, and observe a trade-off between gate power and robustness against unwanted frequency offsets.

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  • Received 13 August 2018

DOI:https://doi.org/10.1103/PhysRevA.98.032318

©2018 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Pak Hong Leung1,* and Kenneth R. Brown2

  • 1Department of Physics, Duke University, Durham, North Carolina 27708, USA
  • 2Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA

  • *james.leung@duke.edu

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Issue

Vol. 98, Iss. 3 — September 2018

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