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Generation of chiral spin state by quantum simulation (1604.03630v1)

Published 13 Apr 2016 in cond-mat.str-el and quant-ph

Abstract: Chirality of materials in nature appears when there are asymmetries in their lattice structures or interactions in a certain environment. Recent development of quantum simulation technology has enabled the manipulation of qubits. Accordingly, chirality can be realized intentionally rather than passively observed. Here we theoretically provide simple methods to create a chiral spin state in a spin-1/2 qubit system on a square lattice. First, we show that switching ON/OFF the Heisenberg and $XY$ interactions produces the chiral interaction directly in the effective Hamiltonian without controlling local fields. Moreover, when initial states of spin-qubits are appropriately prepared, we prove that the chirality with desirable phase is dynamically obtained. Finally, even for the case where switching ON/OFF the interactions is infeasible and the interactions are always-on, we show that, by preparing an asymmetric initial qubit state, the chirality whose phase is $\pi/2$ is dynamically generated.

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