An Optical Switch for a Quantum Choir of Phonons ✦
Original: "Optically Switched Phonon Superradiance of Surface Acoustic Wave in Diamond"
A laser beam, like a conductor's baton, turns weak spin-phonon coupling in diamond into a powerful phase transition, promising quantum switches on sound.
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A phonon crawls through diamond 100,000 times slower than light—slow enough to be controlled. A weak laser pulse turns scattered spins into a coordinated choir, causing superradiance. It's like flipping a switch to a macroscopic quantum phase. Perhaps soon, quantum computers will exchange entanglement not with light, but with sound.
🎯 Diamond is not only the hardest material but also an excellent sound conductor: the speed of acoustic waves in it reaches 12 km/s, tens of times faster than in air, and almost twice as fast as in steel.
G = \frac{\lambda \Omega}{\omega_m}
Amplification of the bare coupling λ by a laser field with Rabi frequency Ω relative to the phonon frequency ωm
\lambda_c = \frac{\sqrt{(\kappa^2 + \omega_m^2) \omega_m}}{2\Omega} (4\Omega^2 + \Delta^2)^{1/4}
Threshold coupling λc, depending on phonon dissipation κ, laser detuning Δ, and intensity Ω
Scientists
Erwin SchrödingerHugh Everett IIINiels BohrPascual JordanWerner HeisenbergStephen Hawkingquantum information
quantum computer
quantum optics
quantum measurement
quantum decoherence
quantum entanglement
superpositionLaws
Schrödinger equationHeisenberg uncertainty principleHawking radiationsuperposition principleBell's theoremEuler's formula