注入原子相干微脉塞中的场振荡

Multiatom Quantum Coherences in Micromasers as Fuel for Thermal and Nonthermal Machines

In this paper we address the question: To what extent is the quantum state preparation of multiatom clusters (before they are injected into the microwave cavity) instrumental for determining not only the kind of machine we may operate but also the quantitative bounds of its performance? Figuratively speaking, if the multiatom cluster is the "crude oil", the question is: Which preparation of the cluster is the refining process that can deliver a "gasoline" with a "specific octane"? We classify coherences or quantum correlations among the atoms according to their ability to serve as (i) fuel for…

双光子无损微脉塞中原子到混合场态的相干转移

Transfer of coherence from atoms to mixed field states in a two-photon lossless micromaser

我们提出了一个基于双光子微脉泽的从混合态产生非经典态的方案。我们的结论是，更快，以及更高程度的场纯度相比，单光子过程中实现。我们调查所产生的场态的统计特性，初始热和（相位扩散）相干态。准概率被用来描述所产生的场的状态。

Atom-field transfer of coherence in a two-photon micromaser assisted by a classical field

We investigate the transfer of coherence from atoms to a cavity field initially in a statistical mixture in a two-photon micromaser arrangement. The field is progressively modified from a maximum entropy state (thermal state) towards an almost pure state (entropy close to zero) due to its interaction with atoms sent across the cavity. We trace over the atomic variables, i.e., the atomic states are not collapsed by a detector after they leave the cavity. We find that by applying an external classical driving field it is possible to substantially increase the field purity without the need of pre…

Quantum Coherent Route to Bath Induced Entanglement

The micromaser is an archetype experimental setting where a beam of excited two-level atoms is injected into a high-finesse cavity. It has played a pivotal role as a testbed for predictions of quantum optics. We consider a generalized micromaser setting consisting of high-quality cavity pumped by a beam of three-level atoms. The atoms are assumed to be prepared to carry quantum coherence between their excited state doublet. Our objective is to produce quantum entanglement between the right-handed circular (RHC) and left-handed circular (LHC) polarized photons in the cavity, exploiting the quan…

Single-particle machine for quantum thermalization

The long time accumulation of the \textit{random} actions of a single particle "reservoir" on its coupled system can transfer some temperature information of its initial state to the coupled system. This dynamic process can be referred to as a quantum thermalization in the sense that the coupled system can reach a stable thermal equilibrium with a temperature equal to that of the reservoir. We illustrate this idea based on the usual micromaser model, in which a series of initially prepared two-level atoms randomly pass through an electromagnetic cavity. It is found that, when the randomly inje…

单光子相位协变克隆的实验宏观相干性

Experimental macroscopic coherence by phase-covariant cloning of a single photon

我们研究了单光子的高增益光学参量放大产生的多光子态，偏振编码为“量子比特”。实验配置利用高增益制度的最佳相位协变克隆。研究了注入量子比特和介观放大输出场之间相干性的非局域转移的干涉条纹图，其中涉及到4000个光子。本文提出了一种新的概率方法来提取多粒子输出波函数的全部信息。