31–40 of 79 posts
My company can create some of the highest density cold Rydberg (Cs) atom setups in the world. We use our tech for focused ion beams, but I'm interested in this application. Our equipment isn't 'miniature' but everything is in a single 19" rack. If anyone who is an expert on the RF side wants to drop ideas below or contact me at adam@zerok.com to brainstorm please feel free.
The paper also indicates this is a heterodyne technique, so you have to tune to a center frequency like a radio, and the receptivity looks very narrow.
I don't know any details about this particular tech, but I think the article says this can detect radio waves over a relatively large spectrum (0Hz..20GHz) simultaneously. It doesn't mention anything about focusing on any particular frequency, or even if it can say anything about the frequency of a signal. From the article itself, it sounds more like this tech can just detect if ANY signal within this range is present, not particularly what kind of signal. Maybe the tech can "hone in" on a particular signal, but I don't remember reading anything about that.
All the rest, about all the marvelous new possibilities this tech will provide (once developed further) sounds more like somebody from marketing went all out on it. Just as so many things with "quantum" in their name, it sounds mostly like a nothing-burger blown completely out of proportion and context.
Pretty big win for RF. Peak sensitivity -145 dBm/Hz. Little bit of a stretch to say entire RF spectrum, but 0 -> 20 GHz is still really cool.
"In March 2020, the laboratory announced that its scientists analysed the Rydberg sensor's sensitivity to oscillating electric fields over an enormous range of frequencies—from 0 to 10^12 Hertz"
What sort of exotic signal processing solution would be required to support 20GHz of bandwidth at any useful sampling rate and bit depth? How would you actually collect a meaningful amount of information from every station in range simultaneously? I feel like this is something that may be possible in physics, but is not well supported in practical applicability. The amount of signal processing hardware required to su…
Ask Keysight https://www.keysight.com/en/pdx-2935683-pn-UXR0802A/infiniiu... That said most signal processing scopes at high frequencies are analogue, so you are dealing with Giga Samples / Second not bps. But yes to to make sense of the actual data it would require some serious networking and storage but that might not be necessary for many applications.
> That said most signal processing scopes at high frequencies are analogue
I think the state of the art is DC to a few (10s?) GHz with direct sampling, impressive stuff.
Earlier quoted context omitted.
Not that long ago, the radios in a cell phone would be SF.
Indeed! The antenna in mobile phones perform well across a wide range of frequencies due to being fractals! https://en.wikipedia.org/wiki/Fractal_antenna
It seems like lower radio frequencies require really big antennas. Does this somehow work around that enabling very compact low frequency antennas? Low frequencies are very useful because they penetrate structures more easily.
Earlier quoted context omitted.
Ask Keysight https://www.keysight.com/en/pdx-2935683-pn-UXR0802A/infiniiu... That said most signal processing scopes at high frequencies are analogue, so you are dealing with Giga Samples / Second not bps. But yes to to make sense of the actual data it would require some serious networking and storage but that might not be necessary for many applications.
Once you have performed the sampling, or even before that technically, information theory provides the connection between the analogue and the digital. > That said most signal processing scopes at high frequencies are analogue I think the state of the art is DC to a few (10s?) GHz with direct sampling, impressive stuff.
Earlier quoted context omitted.
Indeed! The antenna in mobile phones perform well across a wide range of frequencies due to being fractals! https://en.wikipedia.org/wiki/Fractal_antenna
No, it does so because of solid state tuners, and RF switches.
A fractal antenna's response differs markedly from traditional antenna designs, in that it is capable of operating with good-to-excellent performance at many different frequencies simultaneously.
Is this inaccurate?
The associated electronics are obviously necessary too.