Notes - Quantum Information HT24, Quantum communication
Flashcards
What protocol can be used to demonstrate the communication resource inequality
\[1 \text{ ebit} + 2 \text{ cbits} \implies 1 \text{ qubit}\]
Where
- $1 \text{ ebit}$ is a unit of entanglement
- $1 \text{ cbit}$ is one classical bit
?
Quantum teleportation; sharing a Bell state and then communicating $2$ classical bits is enough to communicate a quantum state.
What protocol can be used to demonstrate the communication resource inequality
\[1 \text{ qubit} \implies 1 \text{ ebit}\]
where
- $1 \text{ ebit}$ is a unit of entanglement
?
Preparing a two qubits in the Bell state, and then sending one qubit.
What protocol can be used to demonstrate the communication resource inequality
\[1 \text{ qubit} \implies 1 \text{ cbit}\]
where
- $1 \text{ ebit}$ is a unit of entanglement
- $1 \text{ cbit}$ is one classical bit
?
Encoding the classical bit as either $ \vert 0\rangle$ or $ \vert 1\rangle$, which can then be decoded perfectly.
What protocol can be used to demonstrate the communication resource inequality
\[1 \text{ ebit} + 1 \text{ qubit} \implies 2 \text{ cbits}\]
where
- $1 \text{ ebit}$ is a unit of entanglement
- $1 \text{ cbit}$ is one classical bit
?
Dense coding.