Entanglement and Confinement in Coupled Quantum Systems

Understand

We study some general properties of coupled quantum systems.

• We consider simple interactions between two copies of identical Hamiltonians such as the SYK model, Pauli spin chains with random magnetic field and harmonic oscillators.
• Such couplings make the ground states close to the thermofield double states of the uncoupled Hamiltonians.
• For the coupled SYK model, we push the numerical computation further towards the thermodynamic limit so that an extrapolation in the size of the system is possible.