It might be that the connection between information entropy and thermodynamic entropy aka Landauer's limit, is because classical computers have to work in a heat bath.
Quantum computers work at low temperatures and with small ensembles, each in thermodynamic isolation from each other, these are called qubits.
--note that photons are ab initio thermodynamically isolated from other photons, so it's a given they can be qubits.
Susskind says that quantum information and its entropy are no less and no more than the entanglement measure, between those same small ensembles of quantum particles.
Once entanglement exists it exists until a measurement is made either locally or by the environment, classically a heat bath.
It's when you try to leave the bathroom that entropy gets complicated . . .
Quantum computers work at low temperatures and with small ensembles, each in thermodynamic isolation from each other, these are called qubits.
--note that photons are ab initio thermodynamically isolated from other photons, so it's a given they can be qubits.
Susskind says that quantum information and its entropy are no less and no more than the entanglement measure, between those same small ensembles of quantum particles.
Once entanglement exists it exists until a measurement is made either locally or by the environment, classically a heat bath.
It's when you try to leave the bathroom that entropy gets complicated . . .