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Related Experiment Videos

Optical selection rules and phase-dependent adiabatic state control in a superconducting quantum circuit.

Yu-xi Liu1, J Q You, L F Wei

  • 1Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi 351-0198, Japan.

Physical Review Letters
|October 4, 2005
PubMed
Summary

We explored optical selection rules in superconducting quantum circuits (SQC). The study reveals that controlling electromagnetic pulses allows selective population transfer in a unique three-level system.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Atomic Physics Analogues

Background:

  • Flux qubits in superconducting quantum circuits (SQC) are crucial for quantum computation.
  • Understanding optical selection rules is key to controlling qubit states.
  • Artificial atoms in SQC exhibit unique behaviors under external magnetic flux variations.

Purpose of the Study:

  • To analyze microwave-assisted optical selection rules in a flux qubit SQC.
  • To investigate the formation of a delta-type three-level system when symmetry is broken.
  • To explore selective population transfer mechanisms in this system.

Main Methods:

  • Analysis of optical selection rules in a flux qubit SQC.
  • Investigation of state parities under specific magnetic flux conditions (phi(e) = phi(0)/2).

Related Experiment Videos

  • Study of adiabatic population transfer using controlled electromagnetic field pulses.

    • Main Results:

    • Well-defined selection rules, analogous to electric-dipole transitions, are observed when phi(e) = phi(0)/2.
    • Broken symmetry (phi(e) != phi(0)/2) leads to a delta-type three-level system where one- and two-photon processes coexist.
    • Adiabatic population transfer in the delta-type system is controllable via pulse amplitudes and phases.

    Conclusions:

    • The study clarifies optical selection rules in flux qubit SQCs.
    • A controllable delta-type three-level system is demonstrated, offering new avenues for quantum manipulation.
    • Control over population transfer using pulse phases, unlike in lambda-type systems, is a significant finding for quantum control.