Related Experiment Video
Updated: Aug 13, 2025
12:19
Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
Published on: April 4, 2017
8.5K
Experimental quantum Hamiltonian identification from measurement time traces.
Shi-Yao Hou1, Hang Li2, Gui-Lu Long2
1Microsystem & Terahertz Research Center and Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621999, China; State Key Laboratory of Low-dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China; The Innovative Center of Quantum Matter, Beijing 100084, China; Tsinghua National Laboratory of Information Science and Technology, Beijing 100084, China.
Science Bulletin
|January 20, 2023
Summary
Researchers demonstrated a quantum Hamiltonian identification algorithm on a nuclear magnetic resonance quantum information processor. The study confirms the algorithm
Area of Science:
- Quantum Information Processing
- Quantum Control
- Quantum System Identification
Background:
- Accurate identification of quantum Hamiltonians is crucial for advancing quantum information processing.
- Existing methods may face challenges in practical implementations and robustness.
Purpose of the Study:
- To experimentally realize and benchmark a recently proposed quantum Hamiltonian identification algorithm.
- To assess the algorithm's performance using liquid nuclear magnetic resonance (NMR).
Main Methods:
- Implementation of the quantum Hamiltonian identification algorithm on a liquid NMR quantum information processor.
- Utilizing free induction decay (FID) signals for experimental data acquisition.
- Development of data processing techniques for practical experimental results.
- Numerical simulations to investigate the impact of decoherence.
Main Results:
- Successful experimental realization of the quantum Hamiltonian identification algorithm.
- Demonstration of data processing methods applicable to experimental NMR data.
- Validation of the algorithm's effectiveness and robustness through experiments and simulations, even in the presence of decoherence.
Conclusions:
- The quantum Hamiltonian identification algorithm is effective and robust for practical quantum systems.
- The study provides a viable experimental pathway for Hamiltonian identification in NMR.
- The findings contribute to the development of reliable quantum control and characterization techniques.
Related Concept Videos
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.1K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.1K
01:192D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
838
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
838
02:45The Quantum-Mechanical Model of an Atom
42.7K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
42.7K
01:10¹H NMR of Labile Protons: Temporal Resolution
1.2K
Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
1.2K
01:19Mass Analyzers: Common Types
674
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
674
04:08The Uncertainty Principle
23.5K
Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He...
23.5K