...I did ask my uncle about this...he just kinda looked at me...and asked...what? I explained again and he gave me a brief description on conductivity, then moved the conversation to another topic. ...
This makes me smile and almost chuckle. Guess he doesn't think there is anything to it

Maybe he hasn't really considered it much, but it sounds like your uncle feels that the basic accepted concepts of conductivity apply more practically to the subject than quantum effects that might be caused by cryoing.
I don't know enough to draw conclusions, but I have been looking into a little.
Did you know:
Jack Bybee did his secret submarine sonar quantum physics stuff in the EARLY 70's?
Bybee apparently felt, at least in 1997, the Bybee filters should go in series at the power input part of the chain and not in other configurations.
Bybee filters are mostly Ceramics, which are created by baking in a kiln?
"Deep cryogenic tempering may be used to increase the strength of gun barrels, engine components, musical instruments and brake rotors. "
"Cryogenic Tempering has been hailed as the single greatest advancement for brass musical instruments in the past 50 years.
By treating the brass musical instruments at ultra cold temperatures, inherent stresses within the structure of the brass are released. This allows your instrument to play cleaner and perform the way it was designed.
Brass instruments respond exceptionally well to the cryogenic process, providing a more pleasant, rounder resonant tone.
Guitar, Piano and Violin strings sound better, stay in tone longer, and last longer.
Valves feel better and smoother.
Horns have a smoother, rounder sound and are freer blowing with improved pitch centering. "
Cyogenics is used to aid in doping one substance onto another substance such as metal onto a semiconductor. Maybe used in creation of bybee filters?
One guy claims:
"Now keep an open mind, cryogenic metal treatment technology
has been used for many years in areas of Aerospace, Nascar, Drag
racing, F1, just to name a few. However, it's not talked about much.
When a metal part is "Cryo'd" it is put into a computer controlled
chamber, where the chamber's jacket is filled with liquid
nitrogen (which never comes in contact with the part), then the
temperature is taken down to -300 F, held there for a period,
then raised slowly to a specified tempering temp.
I'm no "metallurgist" but what I understand, it takes the molecular
tension (due to the manufacturing process) out of the part, re-aligns
the molecules, thus improving the strength, wear resistance, and
resistance to warpage."
and Cryo Science in California claims:
"How Cryogenic Treatment Works!
When metal is initially formed at normal atmospheric pressure and temperature the atoms & molecules are disorganized and there are weak particles in the metal called Austenite, these are actually large unstable particles of carbon.
What cryogenic processing does is to convert these weak and unstable carbon particles into Martensite, which are very strong and stable carbide particles. This transformation takes place the same way that regular carbon (which is soft and weak) is converted into diamonds… which is the hardest most durable material know to man – IT TAKES VERY EXTREME PRESSURE! Diamonds are pure carbon, however they have perfectly aligned carbon atoms!
In Cryogenic Processing the EXTREME PRESSURE comes from the physics of freezing to –300 degrees and the resultant contracting of the metal. This contraction, which would also happen under extreme pressure, forces the atoms & molecules to align and fit together tightly.
Once the metal warms back up to atmospheric temperature and pressure the molecules return to their normal spacing however now they are now highly organized, forming one virtually continuous strength piece of metal without the stress spots and weak particles that were in the metal prior to Cryogenic Processing.
Under a microscope you can actually see that the surface of the metal has become much smoother. This smoothing greatly reduces friction (which greatly reduces heat) and increases the resistance to wear of the metal up to 300%.
Cryogenic Processing works for virtually all kinds of metal or metal alloys and some plastics such as nylon.
Cryo'ing metal golf clubs will increase your driving distance up to 15 yards.
Cryo'd Golf club heads have a greatly enlarged Sweet Spot and that means grater accuracy for your drives.
Cryo'ing Golf balls average a 10 yard increase.
Cryo'd razor blades stay sharp twice as long.
It dramatically increases the tonal quality of brass and metal Musical instruments.
Target shooters Cryo their gun barrels to virtually eliminate heat deformation and increase accuracy.
Motorsports racing enthusiast have their engines, drivetrains, & suspension parts Cryo’d to increase strength by up to 50% and can double the life of engine & drivetrain parts that are subject to wear and fatigue.
Wood Workers, Machine shops, and Plastics fabricators, Cryo their cutting blades and bits to typically increase as much as 2 to 3 times the amount of material cut before having to re-sharpen or replace their blades and bits.
Cryogenic processing is a one-time process that lasts for the life of the item.
Cryo’d metals can be machined or sharpened as much as you have cutting tip or edge and will retain all the improved properties throughout their life.
If you are going to do any Heat treating, nitriding or other massaging of the metals you should do them first and cryo afterwards to clean up any inconsistancies or stresses in the metal that the other treatments may have caused.
You should expect around a 30% to 50% increase in Strength and around double the life for all Cryo’d metal items that are subject to wear and double the resistance to fatigue!
"
Doesn't address what happens on the quantum physics-level, but there seem to be some agreed upon molecular-level benefits.