4,935 research outputs found
A simple technique for high resolution time domain phase noise measurement
A new time domain phase comparator is described. The device uses a novel technique to allow time domain phase measurements to be made with period and time interval counters without the use of offset reference oscillators. The device uses a single reference oscillator and allows measurements with a phase resolution greater than the noise floor of the reference. Data is presented showing a phase resolution of 0.02ps at 5 MHz with a crystal reference. The device has application in measuring the phase stability of systems where approximate phase quadrature can be maintained
Gas purged dry box glove Patent
Gas purged dry box glove reducing permeation of air or moisture into dry box or isolator by diffusion through glov
Double gloves reduce contamination of dry box atmosphere
Pair of encased low permeability hand gloves between which an inert gas circulates reduces dry box contamination. This innovation is applicable to dry boxes using radioactive and alkali metal compounds, submicron powders, and liquid metals
Dynamical studies of macroscopic superposition states: Phase engineering of controlled entangled number states of Bose-Einstein condensate in multiple wells
We provide a scheme for the generation of entangled number states of
Bose-Einstein condensates in multiple wells with cyclic pairwise connectivity.
The condensate ground state in a multiple well trap can self-evolve, when phase
engineered with specific initial phase differences between the neighboring
wells, to a macroscopic superposition state with controllable entanglement --
to multiple well generalization of double well NOON states. We demonstrate
through numerical simulations the creation of entangled states in three and
four wells and then explore the creation of "larger" entangled states where
there are either a larger number of particles in each well or a larger number
of wells. The type of entanglement produced as the particle numbers, or
interaction strength, increases changes in a novel and initially unexpected
manner.Comment: 13 pages, 14 figure
Scale Anomaly Induced Instanton Interaction
The binary interaction of large size instantons in a SU(2) Yang-Mills theory
is obtained from the one-loop effective action for the field strength. The
instanton interaction is calculated as a function of the instanton separation
and in dependence on radius and relative orientation of the instantons. Two
equally oriented instantons with radii large compared with the scale defined by
the gluon condensate have purely attractive interaction, whereas the
interaction of maximal disoriented instantons is repulsive. We argue that the
medium range attractive interaction of the instantons generally holds and is
solely due to the instability of the perturbative vacuum.Comment: 11 LaTex pages (3 figures available on request), in press by Physics
Letters B, UNITUE-THEP-4-199
- …