Quantum Teleportation with One Classical Bit
This work addresses efficiency in quantum communications and security for quantum cryptography, representing an incremental improvement over the conventional two-bit protocol.
The paper tackled the problem of reducing classical communication in quantum teleportation by proposing a modified protocol that requires only one classical bit with probability >1/2, leveraging multiple copies of the qubit and local operations to reset entangled pairs.
Quantum teleportation allows one to transmit an arbitrary qubit from point A to point B using a pair of (pre-shared) entangled qubits and classical bits of information. The conventional protocol for teleportation uses two bits of classical information and assumes that the sender has access to only one copy of the arbitrary qubit to the sent. Here, we ask whether we can do better than two bits of classical information if the sender has access to multiple copies of the qubit to be teleported. We place no restrictions on the qubit states. Consequently, we propose a modified quantum teleportation protocol that allows Alice to reset the state of the entangled pair to its initial state using only local operations. As a result, the proposed teleportation protocol requires the transmission of only one classical bit with a probability greater than one-half. This has implications for efficient quantum communications and security of quantum cryptographic protocols based on quantum entanglement.