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From: Jeroen Belleman <jeroen@nospam.please>
Newsgroups: sci.electronics.design
Subject: Re: A Bi-CMOS electronic photonic integrated circuit quantum light
 detector
Date: Thu, 30 May 2024 14:12:33 +0200
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On 5/30/24 13:39, Phil Hobbs wrote:
> Jeroen Belleman <jeroen@nospam.please> wrote:
>> On 5/30/24 06:56, Jan Panteltje wrote:
>>> World's smallest quantum light detector on a silicon chip
>>> https://www.sciencedaily.com/releases/2024/05/240517164111.htm
>>> Source:
>>> University of Bristol
>>> Summary:
>>> Researchers have made an important breakthrough in scaling quantum
>>> technology by integrating the world's tiniest quantum light detector onto a silicon chip.
>>>
>>> Interesting is the circuit, figure 1 in
>>> https://www.science.org/doi/10.1126/sciadv.adk6890
>>>
>>> the photo diodes dare used as pull-up and pull down to teh transistor base.
>>>
>>> Quantum talk everywhere,
>>> but interesting noise cancellation after the beam splitter.
>>> Anybody knows the basics of this?
>>
>> The very first word of their abstract has a spelling error. That
>> doesn't bode well for the rest.
>>
>> Anyway, it appears the quantum crowd is discovering the advantages
>> of synchronous detection, as has been used for ages in lock-in
>> amplifiers. They call it 'homodyne'. OK, fine.
>>
>> Jeroen Belleman
>>
>>
>>
> 
> “Quantum detector” means a device that detects light one carrier pair per
> time, such as a photodiode or phototube.  There are other sorts, e.g.
> microbolometers.
It was my understanding that all light detectors are quantum detectors,
even bolometers. It's very clear in superconducting edge detectors.

> 
> Homodyne detection is just a word for an interferometer with no frequency
> shift. No woo-woo stuff, apart from photodection itself, which is deeply
> mysterious when you really think about it.
> 
> Cheers
> 
> Phil Hobbs
> 

I'm not really surprised that interactions between waves and matter
are quantized, but I'd love to find a classical argument to explain
the value of Planck's constant.

Jeroen Belleman