Measurement of the mechanical loss of a cooled reflective coating for gravitational wave detection

Posted by klaurent Tokyo

Kavli Affiliate: Tomiyoshi Haruyama | Summary:We have measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam sputtered SiO$_2$ and Ta$_2$O$_5$) in cooled mirrors. The loss was nearly independent of the temperature (4 K $sim$ 300 K), frequency, optical loss, and stress caused by the coating, and the details of the manufacturing processes. The […]


Continue.. Measurement of the mechanical loss of a cooled reflective coating for gravitational wave detection

A classical key distribution system based on Johnson (like) noise – How secure?

Posted by klaurent Caltech

Kavli Affiliate: Amnon Yariv | Summary:We present a comprehensive analysis of the Johnson (like) noise based classical key-distribution scheme presented by Kish [1]. We suggest two passive attack strategies that enable an adversary to gain complete knowledge of the exchanged key. The first approach exploits the transient response of the voltage difference on the transmission […]


Continue.. A classical key distribution system based on Johnson (like) noise – How secure?