[jdrov]

We use a solenoid to drive magnetic fields in our sample (RF frequencies, near field), but yes, we do often envision an absorption or emission event by a given nuclear spin as it changes its spin state in the presence of an even stronger, static magnetic field. We have to carefully match the frequency of the driving magnetic field to the so-called Larmor frequency of the spins, which allows them to absorb the supplied energy.

We're working on understanding possible applications now, and we also wonder whether this is a more commonly available phenomenon than originally thought. As experimentalists, we're very conservative in our claims -- for instance, we explain our observation of the "DTC signature" specifically proposed by theorists, without making claims as to the final interpretation of the results for the existing theory. Instead, our job is to very clearly explain what we did and what resulted, and then we get to see (and in some ways participate in) how the broader condensed matter community comes to understand the phenomena. It's an exciting position to be in, there are still many interesting unknowns!

[Steel_Phoenix]

Is the timing of the crystal influenced by its size, shape, or composition? Does it just double whatever the input signal is, or do you have to find a particular resonant frequency? If you brought a ticking crystal into contact with one that was not, or was ticking at a different frequency, would there be transfer or loss? If you just charge up a corner of a crystal, does it extend to the rest? Can you look for ticking in crystals you haven't charged, and if so, are they readable long enough to be used for dating or information storage?

[ianai]

Thank you so much for your reply!

I wonder if the time crystal could be reinforced to last a while. Then whether two such crystals could be brought to an entangled state?