Related Experiment Video
Updated: May 26, 2025
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
9.5K
Qudit Dynamical Decoupling on a Superconducting Quantum Processor
Vinay Tripathi1,2, Noah Goss3,4, Arian Vezvaee2,5
1University of Southern California, Department of Physics and Astronomy, Los Angeles, California 90089, USA.
Physical Review Letters
|February 21, 2025
Summary
Multilevel qudit systems offer greater information capacity but face decoherence challenges. This study introduces dynamical decoupling protocols to protect qudits, significantly improving quantum state fidelity for scalable quantum computing.
Area of Science:
- Quantum Information Science
- Quantum Computing Architectures
- Superconducting Quantum Systems
Background:
- Multilevel qudit systems offer advantages over traditional qubits for quantum information processing.
- Qudits are more vulnerable to decoherence, noise, and crosstalk, hindering their practical application.
- Dynamical decoupling (DD) is a crucial technique for mitigating decoherence in quantum systems.
Purpose of the Study:
- To develop and experimentally validate dynamical decoupling protocols for multilevel qudit systems.
- To address the increased susceptibility of qudits to decoherence and crosstalk.
- To enhance the fidelity and scalability of qudit-based quantum computing.
Main Methods:
- Development of DD protocols for qudit systems utilizing the Heisenberg-Weyl group.
- Experimental implementation and verification on a superconducting transmon processor supporting qutrits (d=3) and ququarts (d=4).
- Application of single-qudit DD sequences to combat system-bath decoherence and two-qudit DD sequences to suppress cross-Kerr interactions.
Main Results:
- Successful demonstration of single-qudit DD sequences protecting qutrits and ququarts from decoherence.
- Implementation of two-qudit DD sequences effectively suppressing cross-Kerr couplings.
- Significant improvement in the fidelity of time-evolved qutrit Bell states was achieved.
Conclusions:
- Dynamical decoupling protocols based on the Heisenberg-Weyl group are effective for protecting qudit systems.
- Experimental validation on superconducting processors confirms the utility of DD for qudit decoherence mitigation.
- These findings pave the way for scalable qudit-based quantum computing by enhancing quantum state stability.
Related Concept Videos
01:17Magnetic Damping
412
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
412
01:28Types Of Superconductors
921
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
921
01:24Superconductor
1.1K
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
1.1K
01:24Fast Decoupled and DC Powerflow
152
The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
152
01:04¹³C NMR: ¹H–¹³C Decoupling
994
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
994
01:27Electrostatic Boundary Conditions in Dielectrics
1.1K
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...
1.1K