5 papers
Encoding a qubit into multilevel subspaces
Matthew Grace, Constantin Brif, Herschel Rabitz +3
We present a formalism for encoding the logical basis of a qubit into subspaces of multiple physical levels. The need for this multilevel encoding arises naturally in situations wh…
Optimization of thermal noise in multi-loop pendulum suspensions for use in interferometric gravitational-wave detectors
Constantin Brif
We study the thermal-noise spectrum of multi-loop pendulum suspensions for test masses in interferometric gravitational-wave detectors. The dependence of the thermal noise on suspe…
Notes on anelastic effects and thermal noise in suspensions of test masses in interferometric gravitational-wave detectors
Constantin Brif
The thermal noise is expected to be one of the main limiting factors on the sensitivity of interferometric gravitational-wave detectors like LIGO and VIRGO. Thermal fluctuations of…
Classical properties of generalized coherent states: from phase-space dynamics to Bell's inequality
C. Brif, A. Mann, M. Revzen
We review classical properties of harmonic-oscillator coherent states. Then we discuss which of these classical properties are preserved under the group-theoretic generalization of…
Discrete photodetection and Susskind-Glogower ladder operators
Y. Ben-Aryeh, C. Brif
We assert that state reduction processes in different types of photodetection experiments are described by using different kinds of ladder operators. A special model of discrete ph…