Demonstration of Universal Parametric Entangling Gates on a Multi-Qubit Lattice

  1. M. Reagor,
  2. C. B. Osborn,
  3. N. Tezak,
  4. A. Staley,
  5. G. Prawiroatmodjo,
  6. M. Scheer,
  7. N. Alidoust,
  8. E. A. Sete,
  9. N. Didier,
  10. M. P. da Silva,
  11. E. Acala,
  12. J. Angeles,
  13. A. Bestwick,
  14. M. Block,
  15. B. Bloom,
  16. A. Bradley,
  17. C. Bui,
  18. S. Caldwell,
  19. L. Capelluto,
  20. R. Chilcott,
  21. J. Cordova,
  22. G. Crossman,
  23. M. Curtis,
  24. S. Deshpande,
  25. T. El Bouayadi,
  26. D. Girshovich,
  27. S. Hong,
  28. A. Hudson,
  29. P. Karalekas,
  30. K. Kuang,
  31. M. Lenihan,
  32. R. Manenti,
  33. T. Manning,
  34. J. Marshall,
  35. Y. Mohan,
  36. W. O'Brien,
  37. J. Otterbach,
  38. A. Papageorge,
  39. J.-P. Paquette,
  40. M. Pelstring,
  41. A. Polloreno,
  42. V. Rawat,
  43. C. A. Ryan,
  44. R. Renzas,
  45. N. Rubin,
  46. D. Russell,
  47. M. Rust,
  48. D. Scarabelli,
  49. M. Selvanayagam,
  50. R. Sinclair,
  51. R. Smith,
  52. M. Suska,
  53. T.-W. To,
  54. M. Vahidpour,
  55. N. Vodrahalli,
  56. T. Whyland,
  57. K. Yadav,
  58. W. Zeng,
  59. and C. T. Rigetti
We show that parametric coupling techniques can be used to generate selective entangling interactions for multi-qubit processors. By inducing coherent population exchange between adjacent qubits under frequency modulation, we implement a universal gateset for a linear array of four superconducting qubits. An average process fidelity of =93% is measured by benchmarking three two-qubit gates with quantum process tomography. In order to test the suitability of these techniques for larger computations, we prepare a six-qubit register in all possible bitstring permutations and monitor the performance of a two-qubit gate on another pair of qubits. Across all these experiments, an average fidelity of =91.6±2.6% is observed. These results thus offer a path to a scalable architecture with high selectivity and low crosstalk.
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