Related Experiment Video
Updated: Jan 7, 2026
12:19
Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
Published on: April 4, 2017
8.8K
Experimental Joint Estimation of Phase and Phase Diffusion Via Deterministic Bell Measurements.
Ben Wang1, Minghao Mi1, Huangqiuchen Wang1
1National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation, College of Engineering and Applied Sciences, Jiangsu Physical Science Research Center, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 26, 2025
Summary
This study enhances quantum metrology by jointly estimating phase and phase diffusion. Collective measurements using Bell states improve precision beyond single-copy limits, offering a new framework for noisy quantum systems.
Area of Science:
- Quantum Information Science
- Quantum Metrology
- Quantum Optics
Background:
- Phase estimation is crucial for quantum metrology but is degraded by phase-diffusive noise.
- Joint estimation of phase and phase diffusion addresses this noise but faces measurement incompatibility issues.
- Single-copy measurements cannot achieve the quantum Cramér-Rao bound due to parameter incompatibility.
Purpose of the Study:
- To experimentally demonstrate joint phase and phase-diffusion estimation.
- To investigate the benefits of collective measurements over separable measurements for precision enhancement.
- To propose a new framework for phase estimation under phase-diffusive noise.
Main Methods:
- Utilized a two-qubit system for joint parameter estimation.
- Employed a linear optical network for deterministic Bell measurements.
- Implemented collective measurements on multiple identical copies of the quantum state.
Main Results:
- Achieved improved estimation precision compared to separable measurement strategies.
- Demonstrated the effectiveness of deterministic Bell measurements in joint estimation.
- Showcased the advantage of collective measurements in mitigating parameter incompatibility.
Conclusions:
- Collective measurements offer substantial advantages for multi-parameter quantum metrology.
- The proposed framework provides a robust method for phase estimation in the presence of phase-diffusive noise.
- Deterministic Bell measurements are a viable tool for advanced quantum sensing applications.
More Related Videos
Related Concept Videos
01:24Time and frequency -Domain Interpretation of Phase-lead Control
408
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
408
01:05Estimation of the Physical Quantities
7.2K
On many occasions, physicists, other scientists, and engineers need to make estimates of a particular quantity. These are sometimes referred to as guesstimates, order-of-magnitude approximations, back-of-the-envelope calculations, or Fermi calculations. The physicist Enrico Fermi was famous for his ability to estimate various kinds of data with surprising precision. Estimating does not mean guessing a number or a formula at random. Instead, estimation means using prior experience and sound...
7.2K
01:08Determination of Expected Frequency
2.5K
Suppose one wants to test independence between the two variables of a contingency table. The values in the table constitute the observed frequencies of the dataset. But how does one determine the expected frequency of the dataset? One of the important assumptions is that the two variables are independent, which means the variables do not influence each other. For independent variables, the statistical probability of any event involving both variables is calculated by multiplying the individual...
2.5K
01:21Time and frequency -Domain Interpretation of Phase-lag Control
374
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
374
00:59Propagation of Uncertainty from Random Error
1.6K
An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
1.6K
02:18Interference and Diffraction
51.5K
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
51.5K