Regular Article

Maximal entanglement and state transfer using Arthurs–Kelly type interaction for qubits

¹ Department of Physics, Indian Institute of Science, Bangalore 560012, India
² HBCSE, Tata Institute of Fundamental Research, Mumbai 400088, India

^a e-mail: subhayan@terpmail.umd.edu

Received: 17 August 2018
Received in final form: 13 October 2018
Published online: 11 December 2018

Abstract

We study entanglement generation between a system qubit and three apparatus qubits using an exactly solvable Arthurs–Kelly type model. We demonstrate the possibility of generating an EPR-like maximally entangled system-apparatus state, in which the second qubit of the usual EPR state is replaced by a three qubit state. We design a very simple protocol to transfer the unknown state of the system onto one of the apparatus qubits which can then be sent elsewhere via a quantum channel. This protocol can be seen as an alternative teleportation scheme.