Int J Theor Phys (2018) 57:2121–2123
Controlling Two-Qubit Entangled States in Ion-Trap
Received: 18 January 2018 / Accepted: 22 March 2018 / Published online: 27 March 2018
© Springer Science+Business Media, LLC, part of Springer Nature 2018
Abstract We present a scheme for the preparation of two-qubit entangled states of two two-
level ions. Our scheme is insensitive to both the initial vibrational state and heating. This
protocol may be realizable in the current physical experiment.
Keywords Quantum state preparation · Two-qubit entangled states · The ion-trap systems
Entanglement has been explored as one of the key resources required for quantum infor-
mation processing schemes such as quantum teleportation, quantum dense coding, remote
state preparation, quantum cryptography and so on [1–6]. These schemes have experimen-
tally been proved to be realizable in some physical systems, such as the optical system,
the nuclear magnetic resonance system, the quantum-dot system and the cavity quan-
tum electrodynamics (QED) system. One of the crucial perquisites for realizing quantum
information processing is quantum entanglement. Due to its non-locality and non-classical
correlations, quantum entanglement has been exploited in many applications. Quantum state
preparation plays an essential role in quantum communication and is important in QIP.
During the past decade, a great deal of efforts has been devoted to one-qubit, two-qubit
and many-qubit quantum state preparation. Based on cavity QED, many theoretical propos-
als have been presented for implementing the-qubit quantum state preparation in various
physical systems [7–10].
College of Information Technology, Heilongjiang BaYi Agricultural University, Heilongjiang,
Daqing, 163319, China