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Researchers have established a theoretical framework linking the internal dynamics of general Markovian light sources directly to their quantum advantage in interferometry, moving beyond highly controlled single-mode systems. By expressing quantum Fisher information through the Lindbladian operator, this approach simplifies computational analysis and provides a practical tool for designing tunable optical elements with Kerr non-linearity for precision sensing. This work offers a clear pathway to leveraging existing technology for enhanced sensing applications without requiring full photon wave-packet simulations.
New theory links light source design to quantum advantage in sensing
Quantum-enhanced interferometry’s potential hinges on the characteristics of quantum light sources, like squeezed states.
Erfan Abbasgholinejad, Daniel Malz, Ana Asenjo-Garcia, and Rahul Trivedi have connected the design of light sources to their potential for quantum advantage in sensing. The researchers developed a framework linking a quantum light source’s internal dynamics and emitted photon characteristics to its performance in interferometry, moving beyond analysis of highly controlled, single-mode systems. They demonstrate that tunable optical elements with Kerr non-linearity can always implement the optimal measurement for any given source, offering a pathway to quantum advantage with existing technology. This work provides a useful tool for evaluating and designing quantum light sources for precision sensing applications. The quantum Fisher information (QFI) of photons emitted by a light source directly correlates to its internal…
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