Quantum Controlled Teleportation of Bell State Using Seven-Qubit Entangled State

We demonstrate that a genuine six-qubit entangled state introduced by Tapiador et al. [J. Phys. A42 (2009) 415301] can be used to realize the deterministic controlled teleportation of an arbitrary three-qubit state by performing only the Bell-state measurements.

Download Full-text

Experimental realization of quantum controlled teleportation of arbitrary two-qubit state via a five-qubit entangled state

Chinese Physics B ◽

10.1088/1674-1056/ac43b0 ◽

2021 ◽

Author(s):

Xiao-Fang Liu ◽

Dong-Fen Li ◽

Yun-Dan Zheng ◽

Xiao-Long Yang ◽

Jie Zhou ◽

...

Keyword(s):

Density Matrix ◽

Quantum State ◽

Bell State ◽

Third Party ◽

Controlled Teleportation ◽

Entangled State ◽

Entanglement Measure ◽

Experimental Realization ◽

Operation Process ◽

Photonic States

Abstract Quantum controlled teleportation is the transmission of the quantum state under the supervision of a third party. This paper presents a theoretical and experimental combination of an arbitrary two-qubit quantum controlled teleportation scheme. In the scheme, the sender Alice only needs to perform two Bell state measurements, and the receiver Bob can perform the appropriate unitary operation to reconstruct arbitrary two-qubit states under the control of the supervisor Charlie. We verified the operation process of the scheme on the IBM Quantum Experience platform and further checked the accuracy of the transmitted quantum state by performing quantum state tomography. Meanwhile, good fidelity is obtained by calculating the theoretical density matrix and the experimental density matrix. We also introduced a sequence of photonic states to analyze the possible intercept-replace-resend, intercept-measure-resend, and entanglement-measure-resend attacks on this scheme. The results proved that our scheme is highly secure.

Download Full-text

EFFICIENT QUANTUM CIRCUITS FOR PERFECT AND CONTROLLED TELEPORTATION OF n-QUBIT NON-MAXIMALLY ENTANGLED STATES OF GENERALIZED BELL-TYPE

International Journal of Quantum Information ◽

10.1142/s0219749911007368 ◽

2011 ◽

Vol 09 (supp01) ◽

pp. 389-403 ◽

Cited By ~ 20

Author(s):

ANIRBAN PATHAK ◽

ANINDITA BANERJEE

Keyword(s):

Quantum Channel ◽

Quantum Teleportation ◽

Bell State ◽

Ghz State ◽

Quantum Circuits ◽

Controlled Teleportation ◽

Entangled State ◽

Maximally Entangled State ◽

Tripartite Entangled State ◽

Maximally Entangled States

An efficient and economical scheme is proposed for the perfect quantum teleportation of n-qubit non-maximally entangled state of generalized Bell-type. A Bell state is used as the quantum channel in the proposed scheme. It is also shown that the controlled teleportation of this n-qubit state can be achieved by using a GHZ state or a GHZ-like state as quantum channel. The proposed schemes are economical because for the perfect and controlled teleportation of n-qubit non-maximally entangled state of generalized Bell-type, we only need a Bell state and a tripartite entangled state respectively. It is also established that there exists a family of 12 orthogonal tripartite GHZ-like states which can be used as quantum channel for controlled teleportation. The proposed protocols are critically compared with the existing protocols.

Download Full-text

Deterministic quantum cyclic controlled teleportation of arbitrary multi-qubit states using multi-qubit partially entangled channel

Modern Physics Letters A ◽

10.1142/s0217732320502041 ◽

2020 ◽

Vol 35 (25) ◽

pp. 2050204

Author(s):

Shiya Sun ◽

Huisheng Zhang

Keyword(s):

Communication Networks ◽

Quantum Channel ◽

Success Probability ◽

Bell State ◽

Qubit State ◽

Controlled Teleportation ◽

Entangled State ◽

Single Qubit ◽

Qubit States ◽

Partially Entangled Channel

In this paper, we present a deterministic four-party quantum cyclic controlled teleportation (QCYCT) scheme, by using a multi-qubit partially entangled state as the quantum channel. In this scheme, Alice can teleport an arbitrary [Formula: see text]-qubit state to Bob, Bob can teleport an arbitrary [Formula: see text]-qubit state to Charlie and Charlie can teleport an arbitrary [Formula: see text]-qubit state to Alice under the control of the supervisor David. We utilize rotation gate, Hadamard gates and controlled-NOT (CNOT) gates to construct the multi-qubit partially entangled channel. Only Bell-state measurements, single-qubit von-Neumann measurement and proper unitary operations are required in this scheme, which can be realized in practice easily based on the present quantum experiment technologies. The direction of cyclic controlled teleportation of arbitrary multi-qubit states can also be changed by altering the quantum channel. Analysis demonstrates that the success probability of the proposed scheme can still reach 100% although the quantum channel is non-maximally entangled. Furthermore, the proposed four-party scheme can be generalized into the case involving [Formula: see text] correspondents, which is more suitable for quantum communication networks. We also calculate the intrinsic efficiency and discuss the security of the proposed scheme. Compared with the existing QCYCT schemes which realized cyclic controlled teleportation of arbitrary single-qubit states, specific two-qubit and three-qubit states, the proposed scheme is of general significance.

Download Full-text

Improvement on cyclic controlled teleportation by using a seven-qubit entangled state

Optical and Quantum Electronics ◽

10.1007/s11082-021-03098-1 ◽

2021 ◽

Vol 53 (8) ◽

Author(s):

Vikram Verma ◽

Dhiraj Yadav ◽

Devendra Kumar Mishra

Keyword(s):

Controlled Teleportation ◽

Entangled State

Download Full-text

Measurement of entropy and quantum coherence properties of two type-I entangled photonic qubits

Optical and Quantum Electronics ◽

10.1007/s11082-021-03067-8 ◽

2021 ◽

Vol 53 (7) ◽

Author(s):

Ali Motazedifard ◽

Seyed Ahmad Madani ◽

N. S. Vayaghan

Keyword(s):

Maximum Likelihood ◽

Quantum Coherence ◽

Single Photon ◽

Bell Inequality ◽

Bell State ◽

Von Neumann Entropy ◽

Entangled State ◽

Type I ◽

Variable Theory ◽

High Brightness

AbstractUsing the type-I SPDC process in BBO nonlinear crystal, we generate a polarization-entangled state near to the maximally-entangled Bell-state with high-visibility (high-brightness) 98.50 ± 1.33% (87.71 ± 4.45%) for HV (DA) basis. We calculate the CHSH version of the Bell inequality, as a nonlocal realism test, and find a strong violation from the classical physics or any hidden variable theory, S = 2.71 ± 0.10. Via measuring the coincidence count rate in the SPDC process, we obtain the quantum efficiency of single-photon detectors around (25.5 ± 3.4)%, which is in good agreement to their manufacturer company. As expected, we verify the linear dependency of the CC rate vs. pump power of input CW-laser, which may yield to find the effective second-order susceptibility crystal. Using the theory of the measurement of qubits, includes a tomographic reconstruction of quantum states due to the linear set of 16 polarization-measurement, together with a maximum-likelihood-technique, which is based on the numerical optimization, we calculate the physical non-negative definite density matrices, which implies on the non-separability and entanglement of prepared state. By having the maximum likelihood density operator, we calculate precisely the entanglement measures such as Concurrence, entanglement of formation, tangle, logarithmic negativity, and different entanglement entropies such as linear entropy, Von-Neumann entropy, and Renyi 2-entropy. Finally, this high-brightness and low-rate entangled photons source can be used for short-range quantum measurements in the Lab.

Download Full-text