Multilevel atoms on a superradiance potential “rollercoaster” inside an optical cavity. The system can be tuned to generate squeezing in a dark state where it will be immune to superradiance. Creditby using spin-squeezed states, achieving groundbreaking control over quantum noise and entanglement, leading to potential leaps in quantum metrology.
In a prior study, done in a collaboration between JILA and NIST Fellows, Ana Maria Rey and James Thompson, the researchers discovered that multilevel atoms offer unique opportunities to harness superradiant emission by instead inducing the atoms to cancel each other’s emissions and remain dark.Rey and her team discovered a method for how to not only create dark states in a cavity, but more importantly, make these states spin squeezed.
In their previous work with Thompson, the JILA researchers found that the dark states must be at least a little bit entangled. The other proposed method involved the transfer of superradiant states into dark states. Here, the team also found other special points where the atoms are close to special “bright” points—not in a valley of the roller coaster, but at points with zero curvature—where the interplay between superradiance and an external laser generates spin-squeezing.
The transfer of squeezed states into dark states not only preserved the reduced noise characteristics of the squeezed states, but also ensured their survival in the absence of being driven by an external laser, a crucial factor for practical applications in quantum metrology.
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