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Phase control of rotational wave packets and quantum information
Kevin F Lee1, D M Villeneuve, P B Corkum
1Steacie Institute for Molecular Sciences, National Research Council, Ottawa, Ontario, Canada K1A 0R6.
Physical Review Letters
|December 17, 2004
Summary
Researchers used lasers to control molecular rotational wave packets in oxygen. They demonstrated switching revivals on/off and doubling revival frequency, akin to quantum logic operations.
Area of Science:
- Molecular Quantum Dynamics
- Laser-Matter Interactions
- Quantum Information Science
Background:
- Lasers can generate rotational wave packets in gas-phase molecules.
- These wave packets exhibit periodic revival as aligned molecular distributions.
- Controlling wave packet evolution is key to manipulating molecular states.
Purpose of the Study:
- To investigate the control of molecular rotational wave packet evolution using weak laser pulses.
- To demonstrate phase control effects at fractional revivals in oxygen molecules.
- To explore the quantum logic operations corresponding to observed phenomena.
Main Methods:
- Generation of rotational wave packets in oxygen using laser pulses.
- Application of secondary, weaker laser pulses at fractional revival times.
- Observation and analysis of changes in wave packet revival dynamics.
Main Results:
- Successfully controlled wave packet evolution by modifying the phase between components.
- Demonstrated coherent switching of revivals on and off.
- Achieved doubling of the revival frequency in oxygen molecules.
Conclusions:
- Phase control of molecular rotational wave packets is feasible with weak laser pulses.
- Observed phenomena directly correspond to fundamental quantum logic operations (Hadamard and T gates).
- This work offers a pathway for quantum information processing using molecular dynamics.