arXiv subjects

R. H. Yue

Publications and source records attributed to R. H. Yue.

4 recordsLinked to original sources

arXiv2007

Designing a Spin Channel for Perfect Quantum Communication

We propose a scheme for using a spin chain with fixed symmetry interaction as a channel for perfect quantum communication. The perfect quantum communication is determined by the eigenvalues that form a special arithmetical progression, the concrete interaction parameter $J_i$ is obtained as a function of integer and perfect transmission time $t_p$. There are infinite choices of $J_i$ for perfect transmission and one can design the channel according to the requirement of $t_p$. This scheme will provide more choices of spin chain for future experiment in quantum communication.

quant-ph↗

arXiv2007

An Ideal Channel of Long Distance Entanglement in Spin Systems

We propose a scheme for using spin chain to realize an ideal channel of long distance entanglement. The results show that there has different entanglement in different Hilbert subspace, the anisotropic parameter $Δ$ will frustrate the entanglement and the magnetic field affect the entanglement through changing the ground state, the boundary entanglement $C_{1N}$ has the simplest expression in the simplest subspace and it only depend on the first item of the ground state, that item can be increased when a local magnetic field is introduced. Our propose can be handled easily because it only needs a uniform XX open chain initialized in the simplest Hilbert subspace and a bulk magnetic field that absent for the boundary qubits.

quant-ph↗

arXiv2006

Pairwise Entanglement and Local Polarization of Heisenberg Model

The pairwise entanglement and local polarization of the ground state are discussed by studying the Heisenberg XX model in finite qubit case. The results show that: the ground state is composed by the micro state with the minimal total spin 0 (for even qubit) or 1/2 (for odd qubit), local polarization (LP) has intimate relation with the probability of the micro state in the ground state, the stronger the LP the smaller the probability, the same LP corresponding to the same probability; the pairwise entanglement of the ground state is the biggest in all the eigenvectors. We find when the qubit is small, the degenerate of state will decrease the pairwise entanglement, there has great different between the odd and the even qubit chain; when the qubit number is big, the effect of qubit number to the pairwise entanglement will disappear, the limited value will be round about 0.3424.

quant-ph↗

arXiv2005

The algebraic Bethe ansatz for open A_{2n}^{(2)} vertex model

We solve the $A_{2n}^{(2)}$ vertex model with all kinds of diagonal reflecting matrices by using the algebraic Behe ansatz, which includes constructing the multi-particle states and achieving the eigenvalue of the transfer matrix and corresponding Bethe ansatz equations. When the model is $U_q(B_n)$ quantum invariant, our conclusion agrees with that obtained by analytic Bethe ansatz method.

hep-th↗