Thunderbolt is its own very unique connection. There are Thunderbolt to USB adapters that will work. However, the Quantum and the Studio 192 are different class devices.
You cannot use them simultaneously by intended design. There may be unofficial and unsupported ways to combine the I/O of different class devices, but this is generally regarded as problematic for many reasons.
The Quantum is a truly excellent audio interface, but the Studio 192 is no slouch either.
If you require more channels, you might consider getting a DigiMax DP88 and use it with the Studio 192 or the Quantum as well.