PhD Defense: Rebecca Schmieg
This thesis covers our on-demand room-temperature single-photon source with built-in memory exploiting a herald-retrieve scheme. We observe a conditional auto-correlation as low as verifying the single-photon character of our source. Further, high cross-correlations of etween the heralding and retrieval light fields confirm the success of our protocol, indicating highly non-classical correlations between the heralding and retrieval scattered photons. The herald-retrieve scattered photons maintain non-classical correlations for a duration of 0.68 ± 0.08 ms. The second application covered in this thesis is quantum-enhanced magnetic induction tomography (QMIT). We introduce the technique of stroboscopic back-action evasion along with conditional spin-squeezing to the wellknown technique of magnetic induction tomography. We test this new quantum-enhanced measurement protocol in a proof-of-principle experiment. We verify the quantum enhancement by observing 42 % lower quantum noise exploiting conditional spin-squeezing of = (-1.8 0.1) dB between unconditional and conditional measurement, corresponding to a signal-to-noise improvement from 0.72 to 1.2.
Link to Zoom:
https://ucph-ku.zoom.us/j/66808116335?pwd=ajhybGZqNFlsYS9Pb0o5L3FoeXFqdz09
Meeting ID: 668 0811 6335
Passcode: 653674