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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Quantum teleportation without classical channel

M. Al-Amri, Zheng-Hong Li, Muhammad Suhail Zubairy

Published Nov 11, 2016• 1 citation
Publisher

Abstract

For the first time, we show how quantum teleportation can be achieved without the assistance of classical channels. Our protocol does not need any pre-established entangled photon pairs beforehand. Just by utilizing quantum Zeno effect and couterfactual communication idea, we can achieve two goals; entangling a photon and an atom and also disentangling them by non-local interaction. Information is completely transferred from atom to photon with controllable disentanglement processes. More importantly, there is no need to confirm teleportation results via classical channels.

DOI
10.1117/12.2267245

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For the first time, we show how quantum teleportation can be achieved without the assistance of classical channels. Our protocol does not need any pre-established entangled photon pairs beforehand. Just by utilizing quantum Zeno effect and couterfactual communication idea, we can achieve two goals; entangling a photon and an atom and also disentangling them by non-local interaction. Information is completely transferred from atom to photon with controllable disentanglement processes. More importantly, there is no need to confirm teleportation results via classical channels.
We show that an unknown quantum state can be transferred with neither quantum nor classical particle traveling in the transmission channel. Our protocol does not require prearranged entangled photon pairs and Bell measurements. By utilizing quantum Zeno effect and counterfactuality, we can entangle and disentangle a photon and an atom by nonlocal interaction. It is shown that quantum information is completely transferred from an atom to photon due to controllable disentanglement processes. There is no need to cross-check the result via classical channels.
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 be 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 the security of quantum cryptographic protocols based on quantum entanglement.
Abstract Quantum teleportation is an interesting feature of quantum mechanics. Entanglement is used as a link between two remote locations to transfer a quantum state without physically sending it – a process that cannot be realized utilizing merely classical tools. Furthermore it has become evident that teleportation is also an important element of future quantum networks and it can be an ingredient for quantum computation. This article reports for the first time the teleportation from light to atoms. In the experiment discussed, the quantum state of a light beam is transferred to an atomic ensemble. The key element of light‐atom entanglement created via a dispersive interaction lays the foundation for the protocol.
In 1993, C.H. Bennet et. al. had proposed the protocol for quantum teleportation of unknown quantum state. Now, this phenomenon was observed experimentally and numerous applications in quantum telecommunications and informatics are proposed. This method of communication is not direct because it uses classical besides quantum channel. We propose here another scheme where protocol can be established before information transmission and then information is transmitted through quantum electro-dynamic channel of interaction between particles with entangled states. With that, parametric interaction between photons is implemented for coupling of information to this interaction channel and subsequent read out of information. In this scheme, the pair of photons with entangled polarization states is used and parametric interaction trough the field of virtual photons serves as interaction channel.
This paper introduces a protocol for quantum communication that employs entangled and separable pairs of particles, enabling classical information transmission without the need for classical communication between the parties. In this system, one party, Alice, manipulates the entanglement degree of photon pairs within two distinct channels, |ψ⟩ 1 and |ψ⟩ 2. The other party, Bob, subsequently measures the state of these photons. This study uses the entanglement status of each photon pair to encode classical bits: entangled pairs |00⟩ + |11⟩ represent the bit '1', while separable pairs |00⟩ represent '0'. The proposed protocol incorporates a secondary quantum channel that enhances entanglement determination accuracy through additional measurements and phase shifts. The proposed approach stands apart from conventional quantum teleportation, which requires inter-party classical communication, by only requiring an internal classical link at the receiver's end for entanglement status resolution. The proposed method offers benefits when classical communication implementation is impractical or costly. The research highlights the potential of a fully quantum-based communication system, bridging the gap between quantum entanglement and quantum teleportation in a novel, pragmatic manner. While there is a need for improvements to enhance efficiency, security, and reliability, the proposed protocol offers a promising path for future explorations in quantum channel communication.
Bennett and his team pioneered the quantum teleportation protocol, a breakthrough where Alice transmits quantum information to Bob through a pre-shared entangled quantum channel. Remarkably, this transmission occurs without physically moving the information, relying on a combination of classical communication and quantum entanglement. This protocol not only demonstrates the essence of quantum entanglement but also underscores its potential in the realm of information transfer. The success of quantum teleportation experiments extends across various physical systems, with a particular emphasis on achieving effectiveness over long distances. Looking forward, future developments in this field may lead to multi-party protocols, thereby advancing both quantum communication and computing capabilities. A crucial component in quantum teleportation networks is controlled quantum teleportation (CQT), holding significant promise for the emerging concept of the quantum internet. In the preceding chapter, our exploration centered on the practical application of quantum teleportation protocols, with a specific focus on two key approaches: standard quantum teleportation and CQT. Our examination delved into the fundamental principles of quantum teleportation, encompassing critical concepts such as quantum entanglement, non-cloning, superposition, and the importance of measurements like fidelity. Throughout the chapter, we dedicated special attention to both the theoretical and experimental aspects of quantum teleportation, considering the intricacies of systems with continuous variables (CVs) as well as those with discrete variables (DVs).