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Few-photon microwave fields for superconducting transmon-based qudit control
Irina A Solovykh1,2, Andrey V Pashchenko1,3,4, Natalya A Maleeva5
1Lomonosov Moscow State University, Faculty of Physics, Moscow, 119991, Russia.
Beilstein Journal of Nanotechnology
|September 17, 2025
Summary
Researchers propose using nonclassical fields to control superconducting atoms, enabling faster and more efficient quantum computations. This method allows precise population of higher energy levels in qudits for advanced quantum processors.
Area of Science:
- Quantum Computing
- Superconducting Circuits
- Quantum Control
Background:
- Quantum processor efficiency can be improved by using multi-level quantum elements (qudits) instead of two-level qubits.
- Transmon-based superconducting atoms are a promising platform for qudits, but require novel control techniques.
Purpose of the Study:
- To develop a new method for controlling superconducting qudits using nonclassical fields.
- To demonstrate efficient and rapid population of specific energy levels in qudits.
Main Methods:
- Theoretical analysis of qudit control using nonclassical fields.
- Proposing a quantum circuit design for a superconducting transmon system.
Main Results:
- Nonclassical fields enable efficient population of high energy levels from the ground state on demand.
- Control over level population is achieved by tuning the frequency difference between the superconducting atom and the field mode.
- High energy levels can be populated within a sub-nanosecond timescale.
Conclusions:
- The proposed nonclassical field approach offers a viable solution for rapid and precise control of transmon-based qudits.
- This method paves the way for enhanced quantum processor efficiency through advanced qudit control.
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