在超导量子处理器上的Qudit动态解
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
概括
多层次审计系统提供了更大的信息容量,但面临着脱节的挑战. 这项研究引入了保护量子位的动态解协议,显著提高了可扩展量子计算的量子状态忠实性.
科学领域:
- 量子信息科学 量子信息科学
- 量子计算架构 量子计算架构
- 超导量子系统是超导量子系统.
背景情况:
- 多层量子比特系统在量子信息处理方面比传统量子比特具有优势.
- 库迪特更容易受到脱凝,噪音和交叉声响的影响,这阻碍了它们的实际应用.
- 动态解 (DD) 是减轻量子系统中脱凝的关键技术.
研究的目的:
- 开发和实验验证多层次量子系统的动态解协议.
- 为了解决昆迪特对脱凝和交叉声交换的增加易感性.
- 为了提高基于qudit的量子计算的忠实性和可扩展性.
主要方法:
- 开发用于使用海森堡-韦尔集团的量子系统的DD协议.
- 在一个支持qtrits (d=3) 和ququarts (d=4) 的超导电晶体处理器上进行实验实施和验证.
- 应用单个qudit DD序列来对抗系统浴脱凝和两个qudit DD序列来抑制交叉Kerr相互作用.
主要成果:
- 成功展示了单个qudit的DD序列,保护qutrits和ququarts免受脱凝.
- 实施两次性DDD序列,有效抑制Kerr交叉合.
- 实现了随时间演变的 qutrit Bell 状态的忠实度的显著改善.
结论:
- 基于海森伯格-韦尔组的动态解协议对保护量子系统是有效的.
- 在超导处理器上的实验验证证证了DD对减轻量子脱凝的实用性.
- 这些发现通过增强量子状态稳定性为可扩展的基于qudit的量子计算铺平了道路.
相关概念视频
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