Publications (20)
Conversion of entanglement between continuous variable and qubit systems
Xiao-yu Chen, Liang-neng Wu, Li-zhen Jiang +1
We investigate how entanglement can be transferred between continuous variable and qubit systems. We find that a two-mode squeezed vacuum state and a continuous variable Werner sta…
Strong Coupling between a Topological Qubit and a Nanomechanical Resonator
Fang-Yu Hong, Huiqin Qian, Jing-Li Fu +2
We describe a scheme that enables a strong coherent coupling between a topological qubit and the quantized motion of a magnetized nanomechanical resonator. This coupling is achieve…
Realignment Entanglement Criterion for Continuous Bipartite Symmetric Quantum States
Xiao-yu Chen, Li-zhen Jiang, Ping Yu +1
The separability of bipartite non-Gaussian states is studied by applying the realignment criterion with the technique of functional analysis. The realignment criterion is given as…
Quantum state conversion between continuous variable and qubits systems
Xiao-yu Chen, Liang Han, Li-zhen Jiang
We investigate how quantum state can be converted between continuous variable and qubits systems. Non-linear Jaynes-Cumings interaction Hamiltonian is introduced to accomplish the…
Relative entropy of entanglement of a kind of two qubit entangled states
Xiao-yu Chen, Li-min Meng, Li-zhen Jiang +1
We in this paper strictly prove that some block diagonalizable two qubit entangled state with six none zero elements reaches its quantum relative entropy entanglement by the a sepa…
Entanglement bound for multipartite pure states based on local measurements
Li-zhen Jiang, Xiao-yu Chen, Tian-yu Ye
An entanglement bound based on local measurements is introduced for multipartite pure states. It is the upper bound of the geometric measure and the relative entropy of entanglemen…
Necessary and sufficient criterion for k-separability of N-qubit noisy GHZ states
Xiao-yu Chen, Li-zhen Jiang, Zhu-an Xu
A Multipartite entangled state has many different kinds of entanglement specified by the number of partitions. The most essential example of multipartite entanglement is the entang…
The coherent information of Pauli channels with coded inputs
Xiao-yu Chen, Li-zhen Jiang
The calculating of the coherent information is a fundamental step in obtaining the quantum capacity of a quantum channel. We introduce orthogonal and complete code basis to evaluat…
Precise detection of multipartite entanglement in four-qubit Greenberger--Horne--Zeilinger diagonal states
Xiao-yu Chen, Li-zhen Jiang, Zhu-an Xu
We propose a method of constructing the separability criteria for multipartite quantum states on the basis of entanglement witnesses. The entanglement witnesses are obtained by fin…
A hierarchy of entanglement criteria for four qubit symmetric Greenberger-Horne-Zeilinger diagonal states
Xiao-yu Chen, Li-zhen Jiang
With a two step optimization method of entanglement witness, we analytically propose a set of necessary and sufficient entanglement criteria for four qubit symmetric Greenberger-Ho…
Entanglement bounds for squeezed non-symmetric thermal state
Li-zhen Jiang
I study the three parameters bipartite quantum Gaussian state called squeezed asymmetric thermal state, calculate Gaussian entanglement of formation analytically and the up bound o…
Genuine Entanglement of Four Qubit Cluster Diagonal States
Xiao-yu Chen, Ping Yu, Li-zhen Jiang +1
We reduce the necessary and sufficient biseparable conditions of the four qubit cluster diagonal state to concise forms. Only 4 out of the 15 parameters are proved to be relevant i…
Entanglement Criterion for Coherent Subtraction and Coherent Addition Bipartite Continuous variable States
Li-zhen Jiang, Xiao-yu Chen, Tian-yu Ye +1
Photon subtraction and addition are experimental means of generating non-Gaussian states from Gaussian states. Coherent subtraction or addition is a combination of photon subtracti…
The entanglement of damped noon-state and its performance in phase measurement
Xiao-Yu Chen, Li-zhen Jiang, Liang Han
The state evolution of the initial optical \textit{noon} state is investigated. The residue entanglement of the state is calculated after it is damped by amplitude and phase dampin…
Entanglement and genuine entanglement of three qubit GHZ diagonal states
Xiao-yu Chen, Li-zhen Jiang, Ping Yu +1
We analytically prove the necessary and sufficient criterion for the full separability of three-qubit Greenberger-Horne-Zeilinger (GHZ) diagonal states. The corresponding entanglem…
The entanglement of some non-two-colorable graph states
Xiao-yu Chen, Li-zhen Jiang
We exactly evaluate the entanglement of a six vertex and a nine vertex graph states which correspond to non ''two-colorable'' graphs. The upper bound of entanglement for five verti…
Simultaneous amplification and non-symmetric amplitude damping of two-mode Gaussian state
Xiao-yu Chen, Li-zhen Jiang, Ji-wu Chen
The evolution of two-mode Gaussian state under symmetric amplification, non-symmetric damping and thermal noise is studied. The time dependent solution of the state characteristic…
A Robust Quantum Random Access Memory
Fang-Yu Hong, Yang Xiang, Zhi-Yan Zhu +2
A "bucket brigade" architecture for a quantum random memory of memory cells needs times of quantum manipulation on control circuit nodes per memory call. Here we…
Entanglement of stabilizer codewords
Xiao-yu Chen, Li-zhen Jiang
The geometric measure, the logarithmic robustness and the relative entropy of entanglement are proved to be equal for a stabilizer quantum codeword. The entanglement upper and lowe…
Graph state basis for Pauli Channels
Xiao-yu Chen, Li-zhen Jiang
We introduce graph state basis diagonalization to calculate the coherent information of a quantum code passing through a Pauli channel. The scheme is 5000 times faster than the bes…