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Review of Scientific Instruments

Wide Band Feedback Coherence Control for Superregenerative NQR Spectrometers II

Paul M. Bridenbaugh, GEORGE E. PETERSON

Published May 1, 1965• 12 citations
Publisher
DOI
10.1063/1.1719671

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A wide bandwidth source of weak coherent pulses using feedback from superconducting nanowire single photon detectors

Nathaniel Wilson, Brian E. Vyhnalek

In support of NASA Glenn Research Center’s Quantum Metrology Laboratory (NQML) and Real Time Optical Receiver project (RealTOR) a wide bandwidth source of weak coherent pulses has been implemented with a mode locked c-band laser in combination with a home-built pulse picker. For component characterization in both projects there is a need for a laser source which exhibits short pulses on the order of 1ps as well as a variable repetition rate and mean photon number per pulse. The setup that has been implemented is operable over a wide bandwidth ranging from approximately 4 MHz to 1.4 GHz, and variable mean photon number per pulse. The system implements a novel feedback mechanism using a superconducting nanowire single photon detector and high-resolution time tagger to optimize its extinction ratio via photon arrival times of the weak coherent pulses. This feedback allows for frequency domain studies to be performed with automatic control. The system design as well as characterization data of its performance are presented here.

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PULSEE: A software for the quantum simulation of an extensive set of nuclear magnetic and quadrupole resonance observables

Davide Candoli, Samuele Sanna, V. F. Mitrović

We present an open-source software for the simulation of observables in nuclear magnetic/quadrupole resonance experiments (NMR/NQR) on solid-state samples, developed to assist experimental research in the design of new strategies for the investigation of quantum materials inspired by the early NMR/NQR quantum computation protocols. % The software is based on a quantum mechanical description of nuclear spin dynamics in NMR/NQR experiments and has been widely tested on both theoretical and experimental available results. Moreover, the structure of the software allows an easy generalization of basic experiments to more sophisticated ones, as it includes all the libraries required for the numerical simulation of generic spin systems. In order to make the program easily accessible to a large user base, we developed a user-friendly graphical interface and fully-detailed documentation. Lastly, we portray several examples of the execution of the code that demonstrate the potential of NMR/NQR for the scopes of quantum control and quantum information processing.

•Aug 25, 2021•0 citations
In support of NASA Glenn Research Center’s Quantum Metrology Laboratory (NQML) and Real Time Optical Receiver project (RealTOR) a wide bandwidth source of weak coherent pulses has been implemented with a mode locked c-band laser in combination with a home-built pulse picker. For component characterization in both projects there is a need for a laser source which exhibits short pulses on the order of 1ps as well as a variable repetition rate and mean photon number per pulse. The setup that has been implemented is operable over a wide bandwidth ranging from approximately 4 MHz to 1.4 GHz, and variable mean photon number per pulse. The system implements a novel feedback mechanism using a superconducting nanowire single photon detector and high-resolution time tagger to optimize its extinction ratio via photon arrival times of the weak coherent pulses. This feedback allows for frequency domain studies to be performed with automatic control. The system design as well as characterization data of its performance are presented here.
We present an open-source software for the simulation of observables in nuclear magnetic/quadrupole resonance experiments (NMR/NQR) on solid-state samples, developed to assist experimental research in the design of new strategies for the investigation of quantum materials inspired by the early NMR/NQR quantum computation protocols. % The software is based on a quantum mechanical description of nuclear spin dynamics in NMR/NQR experiments and has been widely tested on both theoretical and experimental available results. Moreover, the structure of the software allows an easy generalization of basic experiments to more sophisticated ones, as it includes all the libraries required for the numerical simulation of generic spin systems. In order to make the program easily accessible to a large user base, we developed a user-friendly graphical interface and fully-detailed documentation. Lastly, we portray several examples of the execution of the code that demonstrate the potential of NMR/NQR for the scopes of quantum control and quantum information processing.