Acoustically induced coherent spin trapping

Spin centers are promising qubits for quantum technologies. Here, we show that the acoustic manipulation of spin qubits in their electronic excited state provides an approach for coherent spin control inaccessible so far. We demonstrate a giant interaction between the strain field of a surface acoustic wave (SAW) and the excited-state spin of silicon vacancies in silicon carbide, which is about two orders of magnitude stronger than in the ground state. The simultaneous spin driving in the ground and excited states with the same SAW leads to the trapping of the spin along a direction given by the frequency detuning from the corresponding spin resonances. The coherence of the spin-trapped states becomes only limited by relaxation processes intrinsic to the ground state. The coherent acoustic manipulation of spins in the ground and excited state provides new opportunities for efficient on-chip quantum information protocols and coherent sensing.

Automated summary

This study demonstrates a new method of acoustic manipulation of spin qubits, showing a significant interaction between surface acoustic waves and the excited-state spin of silicon vacancies, which leads to more coherent spin control. By simultaneously driving spins in the ground and excited states with the same surface acoustic wave, the spins can be trapped along a specific direction. This coherent acoustic manipulation of spins in different states opens up new opportunities for on-chip quantum information protocols and coherent sensing.