Entanglement in a quantum annealing processor

T. Lanting, A. J. Przybysz, A. Yu Smirnov, F. M. Spedalieri, M. H. Amin, A. J. Berkley, R. Harris, F. Altomare, S. Boixo, P. Bunyk, N. Dickson, C. Enderud, J. P. Hilton, E. Hoskinson, M. W. Johnson, E. Ladizinsky, N. Ladizinsky, R. Neufeld, T. Oh, I. PerminovC. Rich, M. C. Thom, E. Tolkacheva, S. Uchaikin, A. B. Wilson, G. Rose

Research output: Contribution to journalArticle

148 Citations (Scopus)

Abstract

Entanglement lies at the core of quantum algorithms designed to solve problems that are intractable by classical approaches. One such algorithm, quantum annealing (QA), provides a promising path to a practical quantum processor. We have built a series of architecturally scalable QA processors consisting of networks of manufactured interacting spins (qubits). Here, we use qubit tunneling spectroscopy to measure the energy eigenspectrum of two- and eight-qubit systems within one such processor, demonstrating quantum coherence in these systems. We present experimental evidence that, during a critical portion of QA, the qubits become entangled and entanglement persists even as these systems reach equilibrium with a thermal environment. Our results provide an encouraging sign that QA is a viable technology for largescale quantum computing.

Original languageEnglish
Article number021041
JournalPhysical Review X
Volume4
Issue number2
DOIs
Publication statusPublished - 2014

Keywords

  • Quantum information
  • Quantum physics
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Entanglement in a quantum annealing processor'. Together they form a unique fingerprint.

  • Cite this

    Lanting, T., Przybysz, A. J., Smirnov, A. Y., Spedalieri, F. M., Amin, M. H., Berkley, A. J., Harris, R., Altomare, F., Boixo, S., Bunyk, P., Dickson, N., Enderud, C., Hilton, J. P., Hoskinson, E., Johnson, M. W., Ladizinsky, E., Ladizinsky, N., Neufeld, R., Oh, T., ... Rose, G. (2014). Entanglement in a quantum annealing processor. Physical Review X, 4(2), [021041]. https://doi.org/10.1103/PhysRevX.4.021041