- 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. Perminov
- C. Rich
- M. C. Thom
- E. Tolkacheva
- S. Uchaikin
- A. B. Wilson
- G. Rose
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 large-scale quantum computing.
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