The paper presents two quantum teleportation protocols against two kinds of collective noise,collective-dephasing noise and collective-rotation noise firstly with four-photon entangled states.Alice,the information state sender,prepares different four-photon entangled states according to the noise,and sends two of them to the information receiver—Bob,and the other two reserved.Alice makes Bell-based measurement between the information state and one of the reserved states.Thus part of the information of the information state will divert to Bob's photon.Then Alice and Bob make single photon measurement on related photons.According to the results of the single photon measurement,Bob makes appropriate unitary operations on the photon without the single photon measurement,and the information state will be obtained,therefore the quantum teleportation under collective noise is realized.The protocols involve two parties(Alice and Bob),and it can be generalized to multiparty controlled teleportation protocols.Moreover,it just needs Bell-based measurement and single photon measurement,so it is feasible in the experiment.
The paper presents two quantum teleportation protocols against two kinds of collective noise,collective-dephasing noise and collective-rotation noise firstly with four-photon entangled states.Alice,the information state sender,prepares different four-photon entangled states according to the noise,and sends two of them to the information receiver—Bob,and the other two reserved.Alice makes Bell-based measurement between the information state and one of the reserved states.Thus part of the information of the information state will divert to Bob's photon.Then Alice and Bob make single photon measurement on related photons.According to the results of the single photon measurement,Bob makes appropriate unitary operations on the photon without the single photon measurement,and the information state will be obtained,therefore the quantum teleportation under collective noise is realized.The protocols involve two parties(Alice and Bob),and it can be generalized to multiparty controlled teleportation protocols.Moreover,it just needs Bell-based measurement and single photon measurement,so it is feasible in the experiment.
Quantum teleportation with optimum quantum resources and hardware in a quantum network poses a pressing and demanding need. Here, we offer a protocol for asymmetric two-way controlled quantum teleportation via employing a sixteen-qubit entangled state as a resource in a quantum network consisting of five communicating participants Alice, Bob1, Bob2, Bob3and Eve. Our protocol is designed so that a sending party (Alice) transmit its three single information-qubits to three different parties Bob1, Bob2& Bob3, respectively and at the mean time, these three parties (Bob1, Bob2& Bob3) send their Bell-like information-qubits back to the sender (Alice) under the supervision of administrator (Eve) by invoking projective Bell State measurements, GHZ-state measurements and X-basis measurements and local unitary operations. Furthermore, we have analyzed intrinsic efficiency of the protocol and compare our scheme with other competitive protocols.
Teleporting a quantum state,the sender Alice disassembles the entire informations into two parts: one purely classical information and the another purely non-classical information,then sends them to the receiver Bob via two different channels.Firstly,sending the purely non-classical part,the EPR pair which consists of two fermions with the spin of 1 2 here plays the key role in the teleportation,one EPR particle is given to Alice,while the other is given to Bob.Alice performs a complete measurement of the von Neumann type on the joint system consisting of the original particle and her EPR particle,this measurement performed in the four eigenstates of the Bell operator leads to collapse the wave packet of the joint wavefunction into the four correlated Bell bases.Through applying the appropriate unitary transformation to the state of his EPR particle Bob can reconstruct a replica of the original state destroyed in Alice's hand.Moreover,this Bell measurement produces two bits of classical information which is sent to Bob,a quantum teleportation is therefore completed.The paper studies the interior relation between EPR pairs of particles and the quantum teleportation.
Achieving near-unity fidelity of Quantum Teleportation (QT) in a noisy environment is an essential requirement for its real-world applications. Towards this goal, we devise a distinctive protocol based on the timing of the sender Alice's Bell-basis measurement, synchronous with the suitably engineered structure of noise in the receiver Bob's wing, without requiring any knowledge or manipulation of Alice's local noise. For this purpose, to finally obtain the teleported states by performing the required unitary operations, Bob has to retain his qubits for only two particular Bell-basis outcomes communicated by Alice, whose corresponding reduced states have no dependence on the noise parameters in Alice's wing. Such postselection is crucial for enhancing the fidelity of the teleported state towards its ideal limit, while ensuring its full independence of Alice's noise. We formulate the specifics of our protocol in terms of a generic two-level quantum system, subjected to a general non-Markovian spin-boson model for dephasing noise. The proposed scheme is illustrated by using any pure maximally/non-maximally entangled state as well as a Werner-type mixed state as resource. In particular, using resource states having small values of entanglement measure, we show that the high fidelity of QT is achievable in the presence of noise. Further, using our scheme, considering even the local regime of Werner states, wherein the Bell-CHSH inequalities are not violated, we show that the QT fidelity in the presence of noise can be appreciably high.
In this paper, a quantum teleportation protocol has been proposed that can simultaneously transmit quantum states in four directions using a single entangled channel. This means that there are four senders who want to transmit state information, and they are Alice, Bob, Charlie, and David. In order to ensure the security of information transmission, the information state of the four is transmitted to four receivers Fancy1, Fancy2, Fancy3, and Fancy4 under the control of the controller Elle. Through unitary transformation and entanglement property, receivers can recover the original quantum state from the four senders, which is easy to implement. The teleportation protocol is perfect.
Abstract This work presents a three-party cyclic quantum teleportation protocol realized through a nine-qubit resource state. In this framework, Alice, Bob, and Charlie simultaneously exchange their respective unknown two-qubit entangled states in a closed-loop configuration using local Bell-state measurements and single-qubit operations with each participant acting as both sender and receiver. We show that the direction of information transfer can be reversed by suitably reallocating the channel qubits among the users, without needing to change the channel state altogether. The scheme is further generalized to an N -party network, enabling cyclic exchange of quantum information through a suitably extended channel. We further demonstrate the practical viability by implementing the proposed nine-qubit quantum channel on a real quantum processor, allowing characterization of its behaviour under realistic hardware noise. The protocol was simulated incorporating five standard noise models were performed to study the teleportation fidelity as a function of both the noise strength and the input-state amplitudes, revealing a clear dependence on initial-state parameters and decoherence rates. Finally, the intrinsic efficiency of the protocol was evaluated and found to surpass that of existing approaches, highlighting its promise for scalable multi-party quantum communication networks.
In this paper, quantum teleportation of one-to-many using ( n +1)-particle entanglement is presented. If the sender (Alice) wants to transmit an unknown quantum state to a distant receiver (Bob), similar to the previous schemes, Alice performs Bell-state measurement on particles belonging to herself and informs the receiver the results through the classical channel. After that, it needs to perform the Hadamard operation on the other ( n −1) particles and measure them as well. With the aid of the measurement results, Bob can operate a corresponding unitary transformation on his particle to reconstruct the original state. Of course, the reconstruction may realize at either location of n , but it cannot realize at all locations at the same time.