Josephson photonics with a two-mode superconducting circuit

被引：41

作者：

Armour, A. D. ^{[1
]}

Kubala, B. ^{[2
]}

Ankerhold, J. ^{[2
]}

机构：

[1] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[2] Univ Ulm, Inst Complex Quantum Syst, D-89069 Ulm, Germany

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 18期

基金：

英国工程与自然科学研究理事会;

关键词：

OPEN QUANTUM-SYSTEMS; COULOMB BLOCKADE; !text type='PYTHON']PYTHON[!/text] FRAMEWORK; DYNAMICS; JUNCTION; TRANSITION; RESONATOR; QUTIP; LASER;

D O I：

10.1103/PhysRevB.91.184508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We analyze the quantum dynamics of two electromagnetic oscillators coupled in series to a voltage-biased Josephson junction. When the applied voltage leads to a Josephson frequency across the junction which matches the sum of the two mode frequencies, tunneling Cooper pairs excite photons in both modes simultaneously leading to far-from-equilibrium states. These states display highly nonclassical features including strong antibunching, violation of Cauchy-Schwartz inequalities, and number squeezing. We obtain approximate analytic results for both the regimes of low and high photon occupancies which are supported by a full numerical treatment. The impact of asymmetries between the two modes is explored, revealing a pronounced enhancement of number squeezing when the modes are damped at different rates.

引用

页数：12

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