In this paper, we first propose a general entanglement distillation protocol for three-particle W class states, which can concentrate the W′ state (non-maximally entangled W state). The general protocol is mainly based on the unitary transformations on the auxiliary particles and the entangled...

A scheme for teleporting an unknown two-particle entangled state via W class states is proposed. In this scheme, the W class entangled states are considered as quantum channels. It is shown that by means of optimal discrimination between two nonorthogonal quantum states, probabilistic...

In this paper, we propose two physical schemes, which can teleport unknown atomic state from user A (Alice) to user B (Bob) using the W class state as quantum channel. The two schemes are all based on Cavity QED techniques. The fidelity of the teleported state in the two schemes is equal to 1.0,...

Following a recent proposal (Phys. Rev. Lett. 85 (2000) 2392) about quantum information processing using dispersive atom–cavity interaction, in this paper, we proposed a physical scheme to concentrate the pure non-maximally entangled atomic states via cavity QED by using atomic collision in a...

We propose a scheme for the non-destructive detection of an unknown Werner state by detecting the steady-state output intensity of the probe field. Moreover, with a similar mechanism, a Werner state can be generated as a stationary state by pumping the cavity field. The numerical simulations...

Quantization and asymptotic behaviour of a variant of discrete random walk on integers are investigated. This variant, the εVk walk, has the novel feature that it uses many identical quantum coins keeping at the same time characteristic quantum features like the quadratically faster than the...

We consider recent schemes [J.M. Liu, B. Weng, Physica A 367 (2006) 215] to teleport unknown atomic states and superposition of zero- and two-photon states using the two-photon Jaynes–Cummings model. Here we do the same using the “full two-photon Jaynes–Cumming”, valid for arbitrary...

In this contribution it is considered a simple and solvable model consisting of a qubit in interaction with an oscillator exposed to a very small “environment” (a second qubit). An isolated qubit–oscillator system having the oscillator initially in one of its energy eigenstates exhibits...

A scheme is proposed for approximately teleporting an unknown atomic state by using the two-photon Jaynes–Cummings model. Only two atoms and one cavity are needed to achieve the teleportation scheme. This scheme can be applied to teleporting the superposition of zero- and two-photon states...

We propose a scheme, through detecting non-ideal large detuned optical cavity decay, to perform quantum teleportation for atomic inherent states. Our scheme has intrinsic robustness beyond Lamb–Dicke limit, and also has ultra-high fidelity even with practical noises which only affect the...