Related Experiment Video
Updated: Jan 7, 2026
07:58
Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads
Published on: July 25, 2025
719
Informationally complete distributed metrology without a shared reference frame
Hua-Qing Xu1,2,3,4, Gong-Chu Li1,2,3,4, Xu-Song Hong1,2,3
1Laboratory of Quantum Information, University of Science and Technology of China, Hefei, China.
Nature Communications
|December 24, 2025
Summary
Researchers developed a new quantum sensing method to overcome reference frame misalignment in space. This technique recovers quantum Fisher information, enabling robust distributed quantum sensing previously hindered by fundamental restrictions.
Area of Science:
- Quantum Information Processing
- Quantum Metrology
- Quantum Communication & Sensing
Background:
- Precise reference frame (RF) identification is crucial for quantum information processing.
- Distributed quantum sensing faces challenges due to absent shared RFs, leading to a no-go theorem restricting information extraction.
- RF misalignment causes decoherence-like noise, degrading sensing performance.
Purpose of the Study:
- To circumvent the no-go theorem in RF-independent distributed metrology.
- To enable complete recovery of quantum Fisher information (QFI) despite RF misalignment.
- To develop practical distributed quantum sensing for space applications.
Main Methods:
- Proposed a reversed-encoding method using two copies of local-unitary-invariant network states.
- Applied local Bell-state measurements to saturate the QFI.
- Mitigated decoherence-like noise stemming from RF misalignment.
Main Results:
- Successfully circumvented the no-go theorem.
- Achieved complete recovery of QFI, overcoming previous limitations.
- Demonstrated that local Bell-state measurements are optimal for QFI saturation.
Conclusions:
- The reversed-encoding method enables robust distributed quantum sensing in the presence of unknown RF misalignment.
- Findings overcome a fundamental restriction previously precluding field applications.
- Paves the way for practical distributed quantum sensing in space-based communication and metrology.
Related Concept Videos
01:27Non-inertial Frames of Reference
7.0K
A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
7.0K
01:03Inertial Frames of Reference
8.6K
Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
8.6K
01:52Accuracy and Precision
13.8K
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. Highly accurate...
13.8K
02:46Uncertainty in Measurement: Reading Instruments
49.8K
Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
49.8K
01:10Units and Standards of Measurement
43.9K
A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, consider a metallic cube. We might define its mass and dimensions by specifying methods for measuring them, such as using a weighing machine and a meter scale. Then, we could define the volume by stating that it is the cube of its side, and we could calculate the density as the mass divided by the volume.
Measurements of physical quantities are...
Measurements of physical quantities are...
43.9K
03:37Uncertainty in Measurement: Accuracy and Precision
99.3K
Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.
99.3K