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International Journal of Quantum Information

Controlled quantum teleportation with the ability to change the destination of qubits

Mahdi Sadeghizadeh, Monireh Houshmand, Mahsa Khorrampanah, Hossein Aghababa, Yousef Mafi

Published Oct 20, 2023• 9 citations
Publisher

Abstract

Quantum sciences and technologies introduce a new arena whose applications are widely used in the microscopic world. Quantum communication is also an important branch of quantum science by which we intend to transmit quantum information. Quantum teleportation is important because it uses the entanglement principle which is unique in quantum space to transmit quantum information. In fact, in this type of protocol, no information is sent and everything is transmitted using the miracle of entanglement. In this paper, an attempt is made to present a quantum teleportation scheme that, unlike the other designs, can change the destination of qubits. This means that at the beginning of the protocol, the receivers have no idea who has sent the qubits, and the controller decides how these communications will work. At last, noise analysis is presented.

DOI
10.1142/s0219749923500405

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Quantum sciences and technologies introduce a new arena whose applications are widely used in the microscopic world. Quantum communication is also an important branch of quantum science by which we intend to transmit quantum information. Quantum teleportation is important because it uses the entanglement principle which is unique in quantum space to transmit quantum information. In fact, in this type of protocol, no information is sent and everything is transmitted using the miracle of entanglement. In this paper, an attempt is made to present a quantum teleportation scheme that, unlike the other designs, can change the destination of qubits. This means that at the beginning of the protocol, the receivers have no idea who has sent the qubits, and the controller decides how these communications will work. At last, noise analysis is presented.
We present a controlled quantum teleportation protocol. In the protocol, quantum information of an unknown state of a 2-level particle is faithfully transmitted from a sender Alice to a remote receiver Bob via an initially shared triplet of entangled particles under the control of the supervisor Charlie. The distributed entangled particles shared by Alice, Bob and Charlie function as a quantum information channel for faithful transmission. We also propose a controlled and secure direct communication scheme by means of this teleportation. After ensuring the security of the quantum channel, Alice encodes the secret message directly on a sequence of particle states and transmits them to Bob supervised by Charlie using this controlled quantum teleportation. Bob can read out the encoded message directly by the measurement on his qubit. In this scheme, the controlled quantum teleportation transmits Alice's message without revealing any information to a potential eavesdropper. Because there is not a transmission of the qubit carrying the secret message between Alice and Bob in the public channel, it is completely secure for controlled and direct secret communication if perfect quantum channel is used. The special feature of this scheme is that the communication between two sides depends on the agreement of a third side to co-operate.
The most important branch of quantum telecommunications is quantum teleportation because in this branch we transmit what we do not know and all about its content without sending any qubits and using only quantum entanglement. In recent years, many designs have been proposed in this field, which are usually not in the hands of users from the beginning, such as the first design of channel qubits, these qubits are transmitted using quantum channels, so establishing security or authentication of users is important. In this paper, we will present a design with an authentication step that is transmitted from the sender simultaneously to 2 unknown qubit receivers, two different qubits. This plan also has 2 controllers for licensing and security review of protocol and destruction of channel qubits in case of error.
Abstract In this study, we propose an encrypted quantum teleportation broadcast scheme using a 6-qubit entangled channel and an encrypted quantum teleportation scheme with a controller via a 7-qubit entangled channel. The quantum state of Alice, to be transmitted, is first encrypted into two distinct states that satisfy certain conditions. As the main sender, Alice designates two agents to transmit encrypted states to two receivers. She shares a 6-qubit entangled state with each party and provides the receivers with a 1-bit classical information containing the chosen encryption. After the agents perform measurements on the corresponding orthogonal bases and send the results to the receivers, each receiver can reconstruct the original state sent by Alice. To enhance security for the receivers, the scheme introduces Alice as a controller. The receivers can reconstruct the original state only if Alice performs a measurement and shares her measurement outcome. The use of encryption ensures that even if an agent’s qubit is intercepted, the actual state remains secure. Alice, as the controller, can also terminate the transmission if a security threat is detected or she change her mind to finish the transmission. The teleportation performance depends on how the qubit is encrypted. For a specific input state used as an example, the protocol obtained a teleportation success probability of 0.9608.
Information security is the backbone of current intelligent systems, such as the Internet of Things (IoT), smart grids, and Machine-to-Machine(M2M) communication. The increasing threat of information security requires new models to ensure the safe transmission of information through such systems. Recently, quantum systems have drawn much attention since they are expected to have a significant impact on the research in information security. This paper proposes a quantum teleportation scheme based on controlled multi-users to ensure the secure information transmission among users. Quantum teleportation is an original key element in a variety of quantum information tasks as well as quantum-based technologies, which plays a pivotal role in the current progress of quantum computing and communication. In the proposed scheme, the sender transmits the information to the receiver under the control of a third user or controller. Here, we show that the efficiency of the proposed scheme depends on the properties of the transmission channel and the honesty of the controller. Compared with various teleportation scheme presented recently in the literature, the most important difference in the proposed scheme is the possibility of suspicion about the honesty of the controller and, consequently, taking proper precautions.
Quantum Broadcast is an important branch with the ability to send known qubits to more than one quantum user. This feature states that a qubit can be transferred using entanglement between qubits without sending even a single qubit of information. This is a miracle today. This paper introduces a new branch in the field of quantum broadcast, the efficiency of which does not change from previous designs, but has two unique new features. First, it is the first quantum broadcast scheme based on entanglement displacement. Second is the first quantum broadcast scheme, which transmits a state similar to Bell entangled states instead of a simple single qubit state.
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.