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Conditional quantum phase gate between two 3-state atoms.

X X Yi1, X H Su, L You

  • 1School of Physics, Georgia Institute of Technology, Atlanta Georgia 30332, USA.

Physical Review Letters
|April 12, 2003
PubMed
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We present a new quantum logic scheme for 3-state atoms using quantum interference. This method enables conditional phase evolution without atomic transitions or populating the quantum data bus.

Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Cavity Quantum Electrodynamics (Cavity QED)

Background:

  • Conditional quantum logic is essential for quantum computation.
  • Existing schemes often require real atomic transitions or bus excitation, limiting efficiency.
  • Controlling multi-state quantum systems is a key challenge.

Purpose of the Study:

  • To propose a novel scheme for conditional quantum logic between two 3-state atoms.
  • To achieve conditional phase evolution without exciting atomic states or the quantum data bus.
  • To utilize quantum interference for efficient and robust quantum operations.

Main Methods:

  • Utilizing a shared quantum data bus (e.g., optical field or vibrational state).
  • Employing quantum interference to mediate interactions.

Related Experiment Videos

  • Using common addressing of atoms with external laser fields.

    • Main Results:

    • Demonstrated successful conditional phase evolution between two 3-state atoms.
    • Achieved logic operations without real atomic internal state transitions.
    • Ensured no population of the quantum data bus during the operation.

    Conclusions:

    • The proposed scheme offers an efficient method for conditional quantum logic in multi-state systems.
    • It minimizes unwanted excitations, paving the way for more robust quantum information processing.
    • The reliance on common addressing simplifies experimental implementation in cavity QED and trapped ion systems.