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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Stimulated Raman adiabatic passage in a three-level superconducting circuit.

K S Kumar1, A Vepsäläinen1, S Danilin1

  • 1Low Temperature Laboratory, Department of Applied Physics, Aalto University School of Science, PO Box 15100, Aalto FI-00076, Finland.

Nature Communications
|February 24, 2016
PubMed
Summary
This summary is machine-generated.

Researchers demonstrated efficient quantum state transfer using stimulated Raman adiabatic passage in superconducting circuits. This technique achieved over 80% population transfer between qubit states, paving the way for advanced quantum computing applications.

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Area of Science:

  • Quantum Information Science
  • Quantum Engineering
  • Superconducting Circuits

Background:

  • Adiabatic manipulation of quantum states is crucial for quantum engineering.
  • It enables fundamental tests and alternative quantum computation models.
  • Stimulated Raman adiabatic passage is a key technique for precise quantum control.

Purpose of the Study:

  • To benchmark stimulated Raman adiabatic passage for circuit quantum electrodynamics.
  • To demonstrate efficient population transfer in a transmon qubit system.
  • To investigate the dynamics of quantum state transfer in the time domain.

Main Methods:

  • Utilized the first three energy levels of a transmon qubit in a ladder configuration.
  • Employed two adiabatic Gaussian-shaped microwave control pulses for population transfer.
  • Performed quantum tomography at successive moments to analyze population dynamics.

Main Results:

  • Achieved a population transfer efficiency greater than 80% between the ground and second excited states.
  • Investigated the time-domain transfer of population during the Raman pulses.
  • Demonstrated the reversibility of the protocol and studied hybrid sequences.

Conclusions:

  • Stimulated Raman adiabatic passage is an effective method for high-fidelity quantum state transfer in superconducting qubits.
  • The technique shows promise for building robust quantum computing architectures.
  • Further studies can explore variations and applications of this adiabatic control protocol.