Portable diamond maser with reduced magnetic field through orientation
arxiv(2024)
Abstract
Masers have the potential to transform medical sensing and boost qubit
readout detection due to their superb low-noise amplification. The
negatively-charged nitrogen vacancy (NV-) diamond maser is the only
continuous-wave solid-state maser discovered at room temperature, however it
suffers from requiring large and bulky magnets which prevent its more
widespread use. We present a significant reduction in size of the entire
diamond maser using a much lighter and small-footprint electromagnet, reducing
the weight from an immovable 2000 kilograms to a portable 30 kilograms. We
achieve a maximum maser output power near -80 dBm, ten times higher than the
first implementation, and have discovered techniques to reduce the magnetic
field strength required for masing by precise manipulation of the spin
orientation. With the diamond maser now shrunk to a size that can fit on a lab
benchtop, we have brought continuous-wave room temperature masers away from the
confines of research laboratories and closer to transforming readouts in
quantum computing, frequency standards and quantum-limited medical sensing.
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