Related Experiment Video
Updated: Jul 4, 2025
00:07
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
8.5K
Simulating Polaritonic Ground States on Noisy Quantum Devices.
Mohammad Hassan1,2, Fabijan Pavošević3, Derek S Wang4
1Department of Physics, City College of New York, New York, New York 10031, United States.
The Journal of Physical Chemistry Letters
|January 29, 2024
Summary
This study introduces a quantum computing framework for simulating light-matter interactions in polaritonic chemistry. The variational quantum eigensolver with polaritonic unitary coupled cluster (VQE-PUCC) method achieves chemical accuracy on noisy quantum devices.
Area of Science:
- Quantum Computing
- Computational Chemistry
- Strong Light-Matter Interactions
- Polaritonic Chemistry
Background:
- Simulating strong light-matter interactions is crucial for polaritonic chemistry.
- Noisy quantum devices present challenges for accurate chemical simulations.
- Quantum algorithms offer a potential pathway for these complex simulations.
Purpose of the Study:
- To develop a general framework for simulating electron-photon-coupled systems on small, noisy quantum devices.
- To enable accurate simulations for polaritonic chemistry applications.
- To explore the robustness of the proposed quantum simulation method.
Main Methods:
- Utilized the variational quantum eigensolver (VQE) algorithm.
- Employed the polaritonic unitary coupled cluster (PUCC) ansatz.
- Implemented qubit reduction techniques leveraging electron-photon parity.
- Applied advanced error mitigation schemes, including reference zero-noise extrapolation.
Main Results:
- Demonstrated a robust VQE-PUCC approach for simulating the H₂ molecule in an optical cavity across various parameters (bond length, cavity frequency, coupling strength).
- Achieved chemical accuracy through symmetry exploitation and error mitigation.
- Quantified performance by measuring ground-state energy and photon number.
Conclusions:
- The VQE-PUCC framework is a viable method for simulating electron-photon-coupled systems on current noisy quantum hardware.
- This approach advances the field of polaritonic chemistry by enabling accurate simulations of molecular light-matter interactions.
- The measured ground-state energy and photon number provide key insights into chemical reactivity and electron-photon correlation.
Related Concept Videos
01:29Potential Due to a Polarized Object
406
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
406
01:31Dielectric Polarization in a Capacitor
4.7K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.7K
01:27Biasing of Metal-Semiconductor Junctions
259
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
259
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.0K
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...
1.0K
01:12Fermi Level Dynamics
250
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
250
01:27Electrostatic Boundary Conditions in Dielectrics
1.2K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
1.2K