We investigate the stabilization mechanism of open quantum batteries driven by a classical field in the weak or strong system-reservoir coupling regime.A protocol to improve the steady-state energy storage performance...We investigate the stabilization mechanism of open quantum batteries driven by a classical field in the weak or strong system-reservoir coupling regime.A protocol to improve the steady-state energy storage performance is proposed by engineering the spectral density of a band-gap environment which is described as the superposition of two inhomogeneous Lorentzian spectrums with different weights.We find out that the interplay between the batteryenvironment-bound state and the reservoir memory effect plays a crucial role in the stabilization performance against energy dissipation.The formation of the bound state and the nonMarkovian effect will be strengthened by adjusting the weights of the environment spectral density.In the charging process,the classical field contributes to enhancing the steady ergotropy.Moreover,the manipulation of the spectrum weights results in the speedup scheme of carrying out the energy storage due to the existence of bound states.In the self-discharging process,increasing the spectral weight allows the battery to maintain a higher steady ergotropy.These results provide a practical approach to achieving optimal quantum batteries with better stabilization performance.展开更多
A new type of superconductive true random number generator (TRNG) based on a negative-inductance superconducting quantum interference device (nSQUID) is proposed. The entropy harnessed to generate random numbers comes...A new type of superconductive true random number generator (TRNG) based on a negative-inductance superconducting quantum interference device (nSQUID) is proposed. The entropy harnessed to generate random numbers comes from the phenomenon of symmetry breaking in the nSQUID. The experimental circuit is fabricated by the Nb-based lift-off process. Low-temperature tests of the circuit verify the basic function of the proposed TRNG. The frequency characteristics of the TRNG have been analyzed by simulation. The generation rate of random numbers is expected to achieve hundreds of megahertz to tens of gigahertz.展开更多
基金supported by Postgraduate Research and Practice Innovation Program of Jiangsu Province(Grant No.KYCX24_3424)funded by SCOAP^(3)。
文摘We investigate the stabilization mechanism of open quantum batteries driven by a classical field in the weak or strong system-reservoir coupling regime.A protocol to improve the steady-state energy storage performance is proposed by engineering the spectral density of a band-gap environment which is described as the superposition of two inhomogeneous Lorentzian spectrums with different weights.We find out that the interplay between the batteryenvironment-bound state and the reservoir memory effect plays a crucial role in the stabilization performance against energy dissipation.The formation of the bound state and the nonMarkovian effect will be strengthened by adjusting the weights of the environment spectral density.In the charging process,the classical field contributes to enhancing the steady ergotropy.Moreover,the manipulation of the spectrum weights results in the speedup scheme of carrying out the energy storage due to the existence of bound states.In the self-discharging process,increasing the spectral weight allows the battery to maintain a higher steady ergotropy.These results provide a practical approach to achieving optimal quantum batteries with better stabilization performance.
基金Supported by the State Key Program for Basic Research of China under Grant No 2011CBA00304the National Natural Science Foundation of China under Grant No 60836001the Tsinghua University Initiative Scientific Research Program under Grant No 20131089314
文摘A new type of superconductive true random number generator (TRNG) based on a negative-inductance superconducting quantum interference device (nSQUID) is proposed. The entropy harnessed to generate random numbers comes from the phenomenon of symmetry breaking in the nSQUID. The experimental circuit is fabricated by the Nb-based lift-off process. Low-temperature tests of the circuit verify the basic function of the proposed TRNG. The frequency characteristics of the TRNG have been analyzed by simulation. The generation rate of random numbers is expected to achieve hundreds of megahertz to tens of gigahertz.
