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Fast multiqubit gates by adiabatic evolution in interacting excited-state manifolds of rydberg atoms and superconducting circuits

Khazali, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevX.10.021054
  3. Publisher: American Physical Society , 2020
  4. Abstract:
  5. Quantum computing and quantum simulation can be implemented by concatenation of one- and two-qubit gates and interactions. For most physical implementations, however, it may be advantageous to explore state components and interactions that depart from this universal paradigm and offer faster or more robust access to more advanced operations on the system. In this article, we show that adiabatic passage along the dark eigenstate of excitation exchange interactions can be used to implement fast multiqubit Toffoli (Ck-NOT) and fan-out (C-NOTk) gates. This mechanism can be realized by simultaneous excitation of atoms to Rydberg levels, featuring resonant exchange interaction. Our theoretical estimates and numerical simulations show that these multiqubit Rydberg gates are possible with errors below 1% for up to 20 qubits. The excitation exchange mechanism is ubiquitous across experimental platforms, and we show that similar multiqubit gates can be implemented in superconducting circuits. © 2020 authors. Published by the American Physical Society
  6. Keywords:
  7. Dielectric losses ; Exchange interactions ; Quantum chemistry ; Quantum optics ; Qubits ; Timing circuits ; Adiabatic evolution ; Adiabatic passages ; Excitation exchange ; Experimental platform ; Multiqubit gates ; Quantum Computing ; Quantum simulations ; Superconducting circuit ; Excited states
  8. Source: Physical Review X ; Volume 10, Issue 2 , June , 2020
  9. URL: https://journals.aps.org/prx/abstract/10.1103/PhysRevX.10.021054