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Teleportation of an Unknown Multi-qubit State

Zhao Yan

Published Jan 1, 2004• 0 citations
OpenAlex

Abstract

In quantum information, qubits were always in superposition states, so how to teleport a multi - qubit state was an important problem. A scheme was proposed which can teleport N - qubit quantum state by means of Einstein - Podolsky - Rosen (EPR) pairs. All of the operations of the scheme was local and within the reach of current technology. This scheme can teleport more information than using singlet particle quantum state .

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Chinese Physics Letters•Mar 1, 2000•59 citations
In quantum information, qubits were always in superposition states, so how to teleport a multi - qubit state was an important problem. A scheme was proposed which can teleport N - qubit quantum state by means of Einstein - Podolsky - Rosen (EPR) pairs. All of the operations of the scheme was local and within the reach of current technology. This scheme can teleport more information than using singlet particle quantum state .
A scheme to teleport an unknown two qubit state from Alice (the sender) to Bob (the receiver) using two Einstein Podolsky Rosen (EPR) pairs is presented, each EPR pair being shared by both Alice and Bob. Firstly, Alice combines each of the two particles in the teleported state with an EPR particle and makes Bell state measurement on each combination. Then she transmits the outcomes of her measurements to Bob classically. According to Alice′s measurement results, Bob can perform appropriate unitary operations on his two EPR particles to retrieve the initial state.
A multi-sender-controlled quantum teleportation scheme is proposed to teleport several secret quan- tum states from different senders to a distance receiver based on only one Einstein-Podolsky-Rosen (EPR) pair with controlled-NOT (CNOT) gates. In the present scheme, several secret single-qubit quantum states are encoded into a multi-qubit entangled quantum state. Two communication modes, i.e., the detecting mode and the message mode, are employed so that the eavesdropping can be detected easily and the teleported message may be recovered efficiently. It has an advantage over teleporting several different quantum states for one scheme run with more efficiency than the previous quantum teleportation schemes. PACS numbers: 03.67.Dd, 03.65.Ud
A scheme for teleporting an unknown quantum state of many particles is proposed. The scheme operates essentially by prearranging the sharing of an Einstein-Podolsky-Rosen-correlated pair of particles every time. We show that after performing a series of Bell-state measurements and single-particle unitary transformations, the unknown state of many particles, which was destroyed at one place, can be reconstructed at another place. Our scheme is actually obtained by generalizing an earlier scheme of Bennett et al. [ Phys. Rev. Lett. 70 (1993) 1895 ; 76 (1996) 722 ] known as quantum teleportation to the multiparticle case.