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Ultrafast gates for single atomic qubits.

W C Campbell1, J Mizrahi, Q Quraishi

  • 1Joint Quantum Institute, University of Maryland Department of Physics and National Institute of Standards and Technology, College Park, Maryland 20742 USA. wes3000@umd.edu

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Researchers achieved fast single-qubit operations on a trapped atom hyperfine qubit using a shaped ultrafast laser pulse. This method enables high-fidelity quantum gates in under 50 picoseconds, demonstrating a strong excitation regime for quantum computing.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Laser Technology

Background:

  • Trapped atom hyperfine qubits are promising for quantum computing.
  • Achieving fast and high-fidelity single-qubit operations is crucial for scalable quantum systems.
  • Ultrafast laser pulses offer potential for rapid manipulation of quantum states.

Purpose of the Study:

  • To demonstrate single-qubit operations on a trapped atom hyperfine qubit.
  • To utilize a single ultrafast laser pulse for qubit manipulation.
  • To achieve gate times significantly shorter than atomic motion periods.

Main Methods:

  • Employing a trapped atom hyperfine qubit.
  • Using a single, shaped ultrafast pulse from a mode-locked laser.
  • Performing a π rotation with precise pulse shaping.

Main Results:

  • Achieved single-qubit operations in less than 50 picoseconds.
  • Demonstrated population transfer exceeding 99% fidelity.
  • Observed negligible spontaneous emission and ac Stark shifts.
  • Confirmed interaction deep within the strong excitation regime (Ω(Rabi)/ν(trap)>10(4)).

Conclusions:

  • Single ultrafast laser pulses can perform high-fidelity single-qubit operations.
  • The demonstrated method is significantly faster than atomic motion, enabling robust quantum gates.
  • This approach advances the development of fast and scalable trapped-atom quantum computers.