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Physics Colloquium Series

Date: Thursday, October 8, 2020

Time: 4:00pm – 5:00pm

Location: Zoom On-Line/Remote
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Meeting ID: 724 907 9639

Speaker: Brian J. Smith, Department of Physics and Oregon Center for Optical, Molecular, and Quantum Science, University of Oregon

Title: Control and Measurement of Quantum Optical Pulses


The ability to manipulate and measure the spectral-temporal waveform of optical pulses has enabled a wide range of applications from ultrafast spectroscopy to high-speed communications. Extending these concepts to quantum light has the potential to enable breakthroughs in optical quantum science and technology. However, filtering, amplifying and optical nonlinear interactions often employed in classical pulse shaping and measurement techniques are incompatible with non-classical light. Controlling and efficiently measuring the pulsed mode structure of quantum light requires efficient means to achieve deterministic, unitary manipulation of pulses that preserves fragile quantum coherences. Here an approach to deterministically modify the pulse-mode structure of quantum states of light within an integrated optical platform is presented. The manipulation method is based upon application of both spectral and temporal phase modulation to the wave packet. With this approach we demonstrate deterministic spectral shift and time-lensing of single-photon wave packets through the application of linear and quadratically-varying temporal phase. Furthermore, application of quadratic spectral phase to a short single-photon pulse maps frequency onto time, which enables one to monitor the single-photon spectrum with a fast photon-counting spectrometer. We demonstrate experimentally the application of spectral shear within an interferometer followed by spectrally-resolved detection enables complete characterization of quantum light pulses. These techniques lay the ground for future quantum wavelength- and time-division multiplexing applications and facilitate interfacing of different physical platforms where quantum information can be stored and manipulated.


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