Quantum Metrology in Double-Morse Potential Achieves Enhanced Estimation with Rising Non-Classicality

The pursuit of robust and controllable quantum states drives innovation in fields ranging from secure communication to advanced computation, and recent research focuses on harnessing the unique properties of specific quantum systems. Firoz Chogle, Berihu Teklu, and Jorge Zubelli, at Khalifa University of Science and Technology, alongside Ernesto Damiani from the University of Milan, investigate the double-Morse potential as a promising resource for generating non-classical states. Their work demonstrates that this potential, with its distinctive double-well structure, exhibits a systematic increase in both non-Gaussianity and non-classicality as a key parameter is adjusted. Crucially, the team reveals that this system allows for highly precise estimations of physical quantities, achieving optimal performance limits with relatively simple measurement techniques, thereby paving the way for practical applications in continuous-variable quantum information processing.

Nonclassical States and Enhanced Quantum Precision

Researchers investigate the creation of nonclassical states of light and their application to quantum metrology within the framework of a double-Morse potential. The study focuses on generating states exhibiting properties beyond those found in classical physics, specifically exploring squeezing and entanglement, to enhance the precision of parameter estimation in quantum measurements. The double-Morse potential serves as a model system allowing detailed control and manipulation of quantum states, enabling the investigation of optimal conditions for nonclassicality and metrological sensitivity. The team demonstrates that carefully engineered states within this potential can achieve significant improvements in precision compared to classical strategies, offering potential benefits for applications such as sensing and imaging, and reveals fundamental limits and trade-offs in quantum metrology.

Quantum States, Entanglement and Precision Measurement

A comprehensive body of research in quantum optics, quantum information, and related fields covers a wide range of topics, including quantum states of light, squeezing, entanglement, and their applications to quantum key distribution and quantum metrology. Researchers are actively exploring methods to improve measurement precision beyond classical limits using quantum resources like entanglement and squeezing, with studies incorporating mathematical physics, measures, integrals, and special functions used in quantum mechanics. Investigations into dynamical systems, chaotic behaviour, the Berry phase in molecular rotations, and controlling molecular wavepackets are also prominent, alongside studies of quantum revivals and continuous variable quantum information processing.

Asymmetry Drives Nonclassical State Generation

This research demonstrates that the double-Morse potential offers a controllable means of creating non-Gaussian quantum states with significant potential for applications in quantum technologies. Scientists derived analytical expressions for the ground state wave function and energy spectrum, revealing a systematic influence of the asymmetry parameter on the system’s properties, and establishing a clear link between structural asymmetry and the generation of these quantum resources. The team further investigated the potential for precise parameter estimation, showing that straightforward position measurements on the system can achieve high precision and saturate fundamental limits on accuracy.

Researchers acknowledge that future work should assess the resilience of these non-Gaussian states to experimental imperfections, such as weak optical coupling, and incorporating the system’s entanglement potential into existing measures of nonlinearity could broaden the analysis to include mixed states and further validate its capabilities for generating entanglement through linear optics. These combined efforts position the double-Morse oscillator as a promising, tunable source of non-Gaussianity for precision metrology and quantum simulation, offering insights into matter-wave packet control and potential applications in quantum information processing and computing.