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FOURTH INTERNATIONAL CONFERENCE ON QUANTUM TECHNOLOGIES (ICQT-2017).

, 2018

Schrödinger cats for quantum internet

Conference on Lasers and Electro-Optics OSA (2018)

Authors:

Demid V Sychev, Alexander E Ulanov, Anastasia A Pushkina, Egor Tiunov, Valery Novikov, AI Lvovsky
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Schrödinger cats for quantum internet

Optica Publishing Group (2018) fth4g.5

Authors:

Demid V Sychev, Alexander E Ulanov, Anastasia A Pushkina, Egor Tiunov, Valery Novikov, AI Lvovsky
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Fisher information for far-field linear optical superresolution via homodyne or heterodyne detection in a higher-order local oscillator mode

Physical Review A American Physical Society (APS) 96:6 (2017) 063829

Authors:

Fan Yang, Ranjith Nair, Mankei Tsang, Christoph Simon, Alexander I Lvovsky
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Noise spectra in balanced optical detectors based on transimpedance amplifiers.

The Review of scientific instruments 88:11 (2017) 113109

Authors:

AV Masalov, A Kuzhamuratov, AI Lvovsky

Abstract:

We present a thorough theoretical analysis and experimental study of the shot and electronic noise spectra of a balanced optical detector based on an operational amplifier connected in a transimpedance scheme. We identify and quantify the primary parameters responsible for the limitations of the circuit, in particular, the bandwidth and shot-to-electronic noise clearance. We find that the shot noise spectrum can be made consistent with the second-order Butterworth filter, while the electronic noise grows linearly with the second power of the frequency. Good agreement between the theory and experiment is observed; however, the capacitances of the operational amplifier input and the photodiodes appear significantly higher than those specified in manufacturers' datasheets. This observation is confirmed by independent tests.
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