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Entangled Photon Interferometry: Development of Photonic Systems Towards Quantum Spectroscopy


Szoke, Szilard (2022) Entangled Photon Interferometry: Development of Photonic Systems Towards Quantum Spectroscopy. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/brct-zh28.


Entangled photon spectroscopy is an emergent field offering the potential to perform nonlinear and non-classical measurements at low photon fluxes. The entangled photon pairs which are generated using a continuous-wave laser pumped spontaneous parametric downconversion (SPDC) process simultaneously display strong correlations in time and anti-correlations in frequency space. Measuring changes in these correlations provides classical and non-classical information about the underlying dynamics and fluctuations of the sample-system. Further, because these two variables are not Fourier conjugates, entangled photon spectroscopy makes it possible to exploit the spectral resolution of continuous-wave lasers, while leveraging the temporal relationship of the near-simultaneously generated photon pairs which effectively mimics an ultrafast pulsed laser experiment. Nonlinear and ultrafast measurements can therefore be performed with low-power sources while also achieving superior signal-to-noise ratios due to the underlying quantum statistics. As photons in a pair can be separately manipulated, spectroscopic setups using these quantum states of light have marked benefits in contrast to measurements performed using traditional single photon states.

Here, we describe our efforts towards implementing quantum interferometers to test the abilities of entangled photon pairs in nonlinear spectroscopic studies. Specifically, we present work on the development of free-space, fiber-optic, and nanophotonic systems that leverage nonlinear materials to generate narrow to broadband entangled photon pairs via SPDC. The numerical methods used for designing and tailoring these entangled photon sources are outlined together with associated experimental limitations. The spectral-temporal correlations of the two-photon states are characterized using fourth-order interferometry, demonstrating Hong-Ou-Mandel interference with picoseconds to femtoseconds coherence times, and wavelengths ranging from the IR to the UV. A monolithic nanophotonics architecture is proposed for completely on-chip, entangled, ultrafast, and nonlinear spectroscopy.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:entangled photons; interferometry; nanophotonics; optics; spectroscopy
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Applied Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Cushing, Scott K.
Thesis Committee:
  • Hadt, Ryan G. (chair)
  • Minnich, Austin J.
  • Marandi, Alireza
  • Cushing, Scott K.
Defense Date:21 January 2022
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0020151
Record Number:CaltechTHESIS:02162022-092446660
Persistent URL:
Related URLs:
URLURL TypeDescription adapted for Chapter 2 adapted for Chapter 5 adapted for Chapter 8
Szoke, Szilard0000-0001-7860-4638
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14499
Deposited By: Szilard Szoke
Deposited On:11 Mar 2022 23:53
Last Modified:08 Nov 2023 00:19

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