Quantum Teleportation with One Classical Bit

TL;DR

This paper proposes a modified quantum teleportation protocol that reduces classical communication from two bits to one bit by leveraging multiple copies of the qubit, enhancing efficiency and security in quantum communication.

Contribution

It introduces a new teleportation protocol that requires only one classical bit, improving upon the standard two-bit protocol by utilizing multiple copies of the qubit.

Findings

Requires only one classical bit with probability > 0.5

Allows resetting the entangled pair to initial state locally

Implications for more efficient quantum communication and cryptography

Abstract

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.