Amazing stuff! This could be a breakthrough!
"The new research has demonstrated how scientists can precisely measure position and momentum of a particle at the same time. The researchers hope this new method could help develop ultra-precise sensor technology which may be used to improve navigation, medicine and astronomy. ...
The approach was first outlined theoretically in 2017, with Tan’s team now performing the first experimental demonstration. The team were able to conduct the experiment using a technological approach they had engineered in a previous study for error-corrected quantum computers. ...
The team used the microscopic vibrational motion of a trapped ion to implement the sensing protocol. These ions were prepared in ‘grid states’, the type of states used in error-corrected quantum computing.
These grid states are then able to measure tiny signals that indicate position and momentum. The measurements were collected with a precision better than the best achieved using only classical sensors. ..."
"... The ability to detect extremely small changes is important across science and technology. Ultra-precise quantum sensors could sharpen navigation in environments where GPS doesn’t work (such as submarines, underground or spaceflight); enhance biological and medical imaging; monitor materials and gravitational systems; or probe fundamental physics. ..."
From the abstract:
"Precise measurements underpin scientific and technological advancements. Quantum mechanics provides an avenue to enhance precision, but it comes with a restriction: Incompatible observables, such as position and momentum, cannot be simultaneously measured to arbitrary accuracy as decreed by Heisenberg’s uncertainty principle.
This restriction can be bypassed by instead measuring commuting modular observables, which are counterparts to the naturally incompatible observables. Here, we measure modular observables to estimate small changes in position and momentum with a single-mode multiparameter sensor.
We deterministically prepare grid states in the mechanical motion of a trapped ion and demonstrate uncertainties in position and momentum below the standard quantum limit (SQL).
Further, we examine another pair of incompatible observables—number and phase. We prepare a different resource—number-phase states—and demonstrate a metrological gain over the SQL.
These results introduce previously unidentified measurement capabilities unavailable to classical systems and mark a substantial step in quantum metrology."
Scientists sidestep Heisenberg uncertainty principle in precision sensing experiment (original news release) "Foundational research opens pathway for next-generation quantum sensors."
Quantum-enhanced multiparameter sensing in a single mode (open access)
Fig. 1. Multiparameter quantum enhanced sensing.
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