Microwave cavity-free hole burning spectroscopy of Er${}^{3+}$:Y${}_2$SiO${}_5$ at millikelvin temperatures

Anton Mladenov, Natalia Pankratova, Dmitriy Sholokhov +3

Efficient quantum memory is of paramount importance for long-distance quantum communications, as well as for complex large-scale computing architectures. We investigate the capabil…