Coherence of quantum non-Gaussian states via nonlinear absorption of quanta

IF 5.6 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Kingshuk Adhikary, Darren W Moore and Radim Filip
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引用次数: 0

Abstract

The linear and phase insensitive absorption of a single quanta via coherent interactions with a saturable system, even a single ground state qubit, is sufficient to deterministically generate quantum non-Gaussian states in an oscillator, even stimulated merely by increasing thermal oscillator energy. However, the resultant states only approach Fock states and therefore do not exhibit quantum coherence. Here we overcome this limitation using a minimal step: a nonlinear phase-insensitive absorption process added to the linear one. The coherent addition of such individually passive processes allows coherence to emerge and increase in phase space without an external drive and with minimal interaction requirements. The coherence of quantum non-Gaussian states emerges because the linear and nonlinear absorption processes are not mutually passive. In the simplest case rotationally symmetric Wigner functions of the oscillator Fock states convert their many negative regions to an extremely complex asymmetric structure in sharp contrast to the rotational symmetry of those obtained by the individual interactions. We extend this case to include an unsaturable absorber (oscillator) and analyse switching between linear and nonlinear absorptions, suitable for broad classes of experiments.
量子非高斯态的非线性吸收相干性
通过与可饱和系统的相干相互作用,单个量子的线性和相位不敏感吸收,即使是单个基态量子比特,也足以在振荡器中确定性地产生量子非高斯态,甚至仅仅通过增加热振荡器能量来刺激。然而,合成态只接近Fock态,因此不表现出量子相干性。在这里,我们用一个最小的步骤克服了这一限制:在线性吸收过程中加入非线性相不敏感吸收过程。这种单独被动过程的相干添加允许相干性出现并增加相空间,而无需外部驱动和最小的相互作用要求。量子非高斯态的相干性是由于线性和非线性吸收过程不是相互被动的。在最简单的情况下,振荡Fock态的旋转对称Wigner函数将它们的许多负区域转换为极其复杂的不对称结构,这与单个相互作用获得的旋转对称形成鲜明对比。我们将这种情况扩展到包括一个不饱和吸收器(振荡器),并分析线性和非线性吸收之间的切换,适用于广泛的实验类别。
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来源期刊
Quantum Science and Technology
Quantum Science and Technology Materials Science-Materials Science (miscellaneous)
CiteScore
11.20
自引率
3.00%
发文量
133
期刊介绍: Driven by advances in technology and experimental capability, the last decade has seen the emergence of quantum technology: a new praxis for controlling the quantum world. It is now possible to engineer complex, multi-component systems that merge the once distinct fields of quantum optics and condensed matter physics. Quantum Science and Technology is a new multidisciplinary, electronic-only journal, devoted to publishing research of the highest quality and impact covering theoretical and experimental advances in the fundamental science and application of all quantum-enabled technologies.
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