Quantum Dynamics of Spins on a Square Lattice

The topological properties of a Heisenberg $XY$ spin model on the square lattice in the form of a two-dimensional Su-Schrieffer-Heeger model is investigated through the quench dynamics. Based on the topological edge states or the higher-order topological corner states of the square lattice, we propose a scheme to transmit quantum states with high quality, including single-excitation state and entangled state, on square lattices. For the transmission of the single-excitation state, when the square lattice is in the topological phase, the maximum fidelity at the corner sites of the lattice is much larger than that of bulk sites. In addition, it has been found that, due to the different symmetries of the spin ladder and the square lattice, the maximally entangled state can be generated between two qubits when a qubit at the edge of the spin ladder is excited initially, while it cannot be generated between two qubits at the corners of the square lattice. However, the maximally entangled state of two qubits at the edge of the spin ladder or the corners of the lattice can both be transmitted to the two qubits at the other side of the lattices with high quality.The topological properties of a Heisenberg $XY$ spin model on the square lattice in the form of a two-dimensional Su-Schrieffer-Heeger model is investigated through the quench dynamics. Based on the topological edge states or the higher-order topological corner states of the square lattice, we propose a scheme to transmit quantum states with high quality, including single-excitation state and entangled state, on square lattices. For the transmission of the single-excitation state, when the square lattice is in the topological phase, the maximum fidelity at the corner sites of the lattice is much larger than that of bulk sites. In addition, it has been found that, due to the different symmetries of the spin ladder and the square lattice, the maximally entangled state can be generated between two qubits when a qubit at the edge of the spin ladder is excited initially, while it cannot be generated between two qubits at the corners of the square lattice. However, the maximally entangled state of two qubits at the edge of the spin ladder or the corners of the lattice can both be transmitted to the two qubits at the other side of the lattices with high quality.

Physical Review ADec 1, 20234 citations

Classical and quantum dynamics of particles with arbitrary spins

V. D. Gershun, V. I. Tkach

Mar 5, 197955 citations

The topological properties of a Heisenberg

XY

spin model on the square lattice in the form of a two-dimensional Su-Schrieffer-Heeger model is investigated through the quench dynamics. Based on the topological edge states or the higher-order topological corner states of the square lattice, we propose a scheme to transmit quantum states with high quality, including single-excitation state and entangled state, on square lattices. For the transmission of the single-excitation state, when the square lattice is in the topological phase, the maximum fidelity at the corner sites of the lattice is much larger than that of bulk sites. In addition, it has been found that, due to the different symmetries of the spin ladder and the square lattice, the maximally entangled state can be generated between two qubits when a qubit at the edge of the spin ladder is excited initially, while it cannot be generated between two qubits at the corners of the square lattice. However, the maximally entangled state of two qubits at the edge of the spin ladder or the corners of the lattice can both be transmitted to the two qubits at the other side of the lattices with high quality.