Harvard Physicists Discover Sound Waves Extend Qubit Coherence
cornell others. We demonstrate complete mechanical coherence protection of silicon vacancy spins in diamond. Image credit: Cornell University others., doi: 10.1038/s41567-026-03369-2.
“A new quantum network idea leverages electron spins in diamond as memory and phonons as information carriers,” explained Harvard researcher Eliza Cornell and team.
“Phonons provide advantages over traditional light-based quantum networking on a chip.”
“They offer a smaller footprint and better integration due to shorter wavelengths compared to light.”
“Phonons can easily couple to solid-state spins and electromagnetic fields, making them ideal for hybrid quantum systems.”
“However, challenges in working with phonons relate to memory protection.”
“Quantum memory must be shielded from the environment to maintain coherence.”
“Existing microwave pulse methods struggle with qubits in phononic cavities.”
The team achieved “total mechanical coherence protection” of silicon vacancy spins in diamond by using a continuous phonon-driving field instead of microwave pulses.
Dressed qubits, less affected by noise, are achieved through this method.
This technique protects spin coherence within phononic cavities, crucial for quantum networks.
Phonons play dual roles in transmitting and securing quantum information.
“Our approach enhances spin-phonon interactions and extends coherence times,” Dr. Cornell noted.
The study was published in Natural Physics on July 15th.
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E. Cornell others. All mechanical coherence protection and fast control of spin qubits. Natural Physics published online on July 15, 2026. doi: 10.1038/s41567-026-03369-2
Source: www.sci.news
