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Updated: May 1, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Measuring quantum coherence in bulk solids using dual phase-locked optical pulses.

Shingo Hayashi¹, Keigo Kato¹, Katsura Norimatsu¹

¹1] Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, Nagatsuta 4259, Yokohama 226-8503, Japan [2] CREST, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan.

Scientific Reports

|March 26, 2014

Summary

We simultaneously measured electronic and phonon coherence in semiconductors and semimetals. Electronic coherence persisted longer in GaAs (~40 fs) than in Bi (~10 fs) at room temperature.

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Last Updated: May 1, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Published on: May 30, 2014

Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

Area of Science:

Condensed matter physics
Quantum optics
Materials science

Background:

Electronic and phonon coherence are typically measured separately due to differing timescales.
Understanding coupled electron-phonon dynamics is crucial for novel material properties.

Purpose of the Study:

To simultaneously measure electronic and phonon coherence.
To investigate the distinct coherence dynamics in semiconducting and semimetallic crystals.

Main Methods:

Utilized interference of electron-phonon correlated states induced by two phase-locked optical pulses.
Employed interferometric visibility to quantify coherence lifetimes.

Main Results:

Observed electronic coherence lasting ~40 fs in a GaAs (semiconductor) crystal.
Found electronic coherence decayed within ~10 fs in a Bi (semimetal) crystal at room temperature.
Highlighted the significant difference between electronic coherence decay and long-lived phonon coherence (picosecond range) in Bi.

Conclusions:

Demonstrated a novel method for simultaneous measurement of electronic and phonon coherence.
Revealed distinct electronic coherence behaviors in semiconductors versus semimetals.
Provided insights into electron-phonon interactions and their impact on quantum coherence.