Extract the Degradation Information in Squeezed States with Machine Learning.

In order to leverage the full power of quantum noise squeezing with unavoidable decoherence, a complete understanding of the degradation in the purity of squeezed light is demanded. By implementing machine-learning architecture with a convolutional neural network, we illustrate a fast, robust, and precise quantum state tomography for continuous variables, through the experimentally measured data generated from the balanced homodyne detectors. Compared with the maximum likelihood estimation method, which suffers from time-consuming and overfitting problems, a well-trained machine fed with squeezed vacuum and squeezed thermal states can complete the task of reconstruction of the density matrix in less than one second.

Frequency-Dependent Squeezed Vacuum Source for Broadband Quantum Noise Reduction in Advanced Gravitational-Wave Detectors.

The astrophysical reach of current and future ground-based gravitational-wave detectors is mostly limited by quantum noise, induced by vacuum fluctuations entering the detector output port. The replacement of this ordinary vacuum field with a squeezed vacuum field has proven to be an effective strategy to mitigate such quantum noise and it is currently used in advanced detectors. However, current squeezing cannot improve the noise across the whole spectrum because of the Heisenberg uncertainty principle: when shot noise at high frequencies is reduced, radiation pressure at low frequencies is increased.

Watt-level single-frequency tapered amplifier laser using a narrowband interference filter.

We demonstrate a tunable external cavity tapered amplifier laser (ECTAL) using a narrowband interference filter as the wavelength discriminator. The laser is tunable over a wavelength range from 1006 to 1031 nm with an output power of ∼1  W. The amplified stimulated emission of the laser system is suppressed to better than 32 dB.

Absolute frequency measurement of molecular iodine hyperfine transitions at 647 nm.

We report absolute frequency measurements of molecular iodine P(46) 5-4 a, a, and a hyperfine transitions at 647 nm with a fiber-based frequency comb. The light source is based on a Littrow-type external-cavity diode laser. A frequency stability of 5×10 at a 200 s integration time is achieved when the light source is stabilized to the P(46) 5-4 a line.

Precise frequency measurements of iodine hyperfine transitions at 671 nm.

We report absolute frequency measurements on the a(1), a(10), and a(15) hyperfine components of the R(78) 4-6 line of (127)I(2). An external-cavity diode laser system at 671 nm is frequency-stabilized to the saturated absorption center obtained by modulation transfer spectroscopy in an iodine vapor cell. Its absolute frequency is measured by an optical frequency comb.

Effect of a robotic prescription-filling system on pharmacy staff activities and prescription-filling time.

Purpose: The effects of using an automated prescription-filling system, the ScriptPro SP-200, in an independent pharmacy were evaluated.

Methods: The study was conducted at Punches Pharmacy Plus, an independent pharmacy located in Clare, Michigan. The study design was a preinstallation and postinstallation assessment of the ScriptPro SP-200 automated prescription-filling system.