Before you get too technical, can you tell us:
What's out there on the market now and how is what you're offering any better/cheaper/different/smaller?
Who is your target audience for this product?
How much would it cost to build the first one? The second one?
If you can answer these, you'll probably attract investment from some interested readers in the forums.
Topic: [survey] What are the ideal properties of a quantum RNG? - page 2. (Read 5333 times)
Assuming I can get 1 random bit every characteristic relaxation time of Sodium Chlorate (T2)...I could grab 256 random bits in 2.56 seconds with ease, since T2 << 10 ms
I could conceivably measure two random bits at least with each T2 since I can grab a metric also of the apparent field angle.
This is because the quadrupole lines are split by a static applied field, so earth's field will be split the levels; moreover, this depends on the instantaneous spin angle with the earths field. Since earths field varies with location, and the crystal orientation can be made to have some randomness, I'm confident in 2 bits/T2 for a single crystal preparation.
In a sample with two inequivalent chlorine sites, this is doubled. Also, if we manage manage to measure 37Cl as well as 35Cl (the abundance of the heavy isotope is 26%) that is an 8x speed up.
There are some samples I know with even shorter T2 whose quadrupole resonance is at nearly 100 MHz, though I've never seen what the S/N is.
I could conceivably measure two random bits at least with each T2 since I can grab a metric also of the apparent field angle.
This is because the quadrupole lines are split by a static applied field, so earth's field will be split the levels; moreover, this depends on the instantaneous spin angle with the earths field. Since earths field varies with location, and the crystal orientation can be made to have some randomness, I'm confident in 2 bits/T2 for a single crystal preparation.
In a sample with two inequivalent chlorine sites, this is doubled. Also, if we manage manage to measure 37Cl as well as 35Cl (the abundance of the heavy isotope is 26%) that is an 8x speed up.
There are some samples I know with even shorter T2 whose quadrupole resonance is at nearly 100 MHz, though I've never seen what the S/N is.
Suppose such device may be widely used in distributed computing generally. 
Bump. Community input is needed.
Op amps offer more flexibility, but purists can even make their own. I have never bothered to wire up my own op amp, but I have, as many have tried, to model one in spice.
It can be done.
There are a few other parts to the entire device I have not yet shown; but I think I've demonstrated you can do this at radio-shack.
(Moved to top)
In order for a device like this to be useful in ways that a bag of dice is not, it has to be able to directly communicate the generated random bits to its consumer somehow. I'm having a hard time figuring how to do that with "parts from Radio Shack".
• I think the device should be able to be constructed with parts one can purchase at radio-shack.
• It should be constructed without integrated circuits in favor of FETs or BJTs one can feel free to exchange for various brands; however the design could be simplified with an IC should the user chose to trust a company (TI, nat semi...) and wishes to create his/her own.
• I think the so inclined user should be able to take it apart and put it back together with a soldering iron; e.g. having as few parts as possible, and provide schematics and documentation.
• I think the user should be able to exchange the "sample cell." For what I am thinking, this would mean replacing the crystalline sample with a home-made one, if one has the chemistry skills to do so.
• Gaseous samples would not be permitted for an NQR device, but could be used with optical spectroscopy. But I do not think optical circuits are simple enough to be "provably untainted." An optical physicist may disagree.
• It should be constructed without integrated circuits in favor of FETs or BJTs one can feel free to exchange for various brands; however the design could be simplified with an IC should the user chose to trust a company (TI, nat semi...) and wishes to create his/her own.
• I think the so inclined user should be able to take it apart and put it back together with a soldering iron; e.g. having as few parts as possible, and provide schematics and documentation.
• I think the user should be able to exchange the "sample cell." For what I am thinking, this would mean replacing the crystalline sample with a home-made one, if one has the chemistry skills to do so.
• Gaseous samples would not be permitted for an NQR device, but could be used with optical spectroscopy. But I do not think optical circuits are simple enough to be "provably untainted." An optical physicist may disagree.
I plan to further the initiative for open source analog technologies for bitcoin, including provably un-backdoored hardware RNG's as a consequence alongside my regular research on the magnetic resonance of quadrupolar nuclei. IMO, solid state magnetic resonance has the potential to present a source of quantum entropy that is inexpensive, extremely simple in design, cheap, small, and...[community input]
What are the desired properties of an ideal, non-deterministic hardware RNG amenable to open source initiatives and furthermore would invite introduction in specialized hardware for the bitcoin protocol?
Things to consider:
• physical size
• power consumption
• I/O
• safety (chlorides are a bit toxic)
• price range
•? everything. Thinking caps on please - think outside the box and consider all possibilities. I need your help to do this.
Please do NOT post "we don't need this, we have deterministic RNGs that work and we can use this curve and bla bla..." - please respect my inquiry. Thank you.
Questions about NMR/NQR are welcome and I will answer all of them, but should perhaps be moved elsewhere if there are many.
Editted: rearranged the thread to answer the "how can it communicate to the user with radioshack parts" question:
Transistor gates
http://en.wikipedia.org/wiki/Transistor%E2%80%93transistor_logic
It is easier of course to use op-amps, but they are black boxes. However by now, many op-amps are essentially open source...of course you never do know what is inside it, only how it performs.
http://en.wikipedia.org/wiki/Digital-to-analog_converter
This is pretty much all it has to do; the NQR FID is (when averaged) an exponentially damped sinusoid and is much like this picture. A very simple circuit would do the trick. Here is a graphic from wikipedia
Here is my data of the transient response in NaClO3 at 29.936 MHz averaged over several thousand pulses
With signal averages, the voltage induced in the coil by the magnetization of the material converges to the nice curve above. However, if only one or a few pulses are used to collect data, the picture is quite different
The above image in black was produced by me with the raw data. Here is the corresponding one produced by the same dysfunctional labview program used to display the first image of the clean FID
I should note the third/fourth image is of a single crystal while the second one was taken for a polycrystalline sample, which eliminates beats due to the earth's magnetic field.
The probe circuit and pre-amplifier of an NQR implementation can be quite simple; I designed this one to use transistors I know are stocked by radio-shack. The power supply is a 9V battery
To collect and represent the data I have shown, I used a sophistocated DAQ board. However, all that is needed is a type of level detector.
Here is a graphic I found online for a simple level detector using only 1 BJT
But I wouldn't necessarily use this design.
What are the desired properties of an ideal, non-deterministic hardware RNG amenable to open source initiatives and furthermore would invite introduction in specialized hardware for the bitcoin protocol?
Things to consider:
• physical size
• power consumption
• I/O
• safety (chlorides are a bit toxic)
• price range
•? everything. Thinking caps on please - think outside the box and consider all possibilities. I need your help to do this.
Please do NOT post "we don't need this, we have deterministic RNGs that work and we can use this curve and bla bla..." - please respect my inquiry. Thank you.
Questions about NMR/NQR are welcome and I will answer all of them, but should perhaps be moved elsewhere if there are many.
Editted: rearranged the thread to answer the "how can it communicate to the user with radioshack parts" question:
Transistor gates
http://en.wikipedia.org/wiki/Transistor%E2%80%93transistor_logic
It is easier of course to use op-amps, but they are black boxes. However by now, many op-amps are essentially open source...of course you never do know what is inside it, only how it performs.
http://en.wikipedia.org/wiki/Digital-to-analog_converter
This is pretty much all it has to do; the NQR FID is (when averaged) an exponentially damped sinusoid and is much like this picture. A very simple circuit would do the trick. Here is a graphic from wikipedia
Here is my data of the transient response in NaClO3 at 29.936 MHz averaged over several thousand pulses
With signal averages, the voltage induced in the coil by the magnetization of the material converges to the nice curve above. However, if only one or a few pulses are used to collect data, the picture is quite different
The above image in black was produced by me with the raw data. Here is the corresponding one produced by the same dysfunctional labview program used to display the first image of the clean FID
I should note the third/fourth image is of a single crystal while the second one was taken for a polycrystalline sample, which eliminates beats due to the earth's magnetic field.
The probe circuit and pre-amplifier of an NQR implementation can be quite simple; I designed this one to use transistors I know are stocked by radio-shack. The power supply is a 9V battery
To collect and represent the data I have shown, I used a sophistocated DAQ board. However, all that is needed is a type of level detector.
Here is a graphic I found online for a simple level detector using only 1 BJT
But I wouldn't necessarily use this design.
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