Xpol

5 ms·

1.
by Xpol 5y ago
You're right, the techniques in NMR like Rabi and Ramsey spectroscopy, spin echoes are all used in atomic clock experiments too.
2.
by Xpol 5y ago
After strontium atoms coming from an oven (usually at 400-ish degrees) reaches the main chamber, they're trapped via both optically (via lasers) and magnetically (there's coils surrounding the chamber), which we called magneto-opt
3.
by Xpol 5y ago
There're problems with increasing atom number. It is true that more atoms will allow one to resolve QPN easier, more atoms make clock rotations (along the Bloch sphere) much harder, as for a spin-squeezed clock doing Ramsey sequence, y
4.
by Xpol 5y ago
What the MIT group achieved was implementing spin-squeezing to clock operation, but their results are not QPN-limited (in fact, they made it above the SQL, so they actually make things worse instead of making it better) [1]. They attributed
5.
by Xpol 5y ago
Yes, LIGO has already implemented squeezed states in their measurements. What I'm referring to is making a spin-squeezed atomic clock with enhanced metrological gain compared to QPN limit. There're several groups working on it and
6.
by Xpol 5y ago
They are not mutually exclusive. There're groups that are developing portable atomic clocks, and then we have this group that are pushing the frontiers. While not in everyday devices, cesium/ rubidium clocks which are less accurat
7.
by Xpol 5y ago
A simple way of thinking it is consider laser as waves, they act like harmonic potentials (like sine curves) with crests and troughs. Atoms that are inside the potentials are trapped, like a ball in a deep well. Atoms trapped in optical lat
8.
by Xpol 5y ago
Yes, in fact, the current state-of-the-art atomic clocks are hitting a limit called the standard quantum limit (SQL) of the quantum projection noise (QPN). Basically, atomic clocks operate by probing atoms with an accurate local oscillator,