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Abstract
Previous experimental studies discovered universal growth of chains and nanowires of various chemical elements on a corrugated molecular network of Cu3N on the Cu(110). Herein, performing combined ab initio and quantum Hamiltonian studies we demonstrate that such chains can be used for a fast spin switching and entanglement generation by locally applied magnetic pulses. As an example, we show that in antiferromagnetic Co chains a strong entanglement between ends of chains occurs during spin switching. A novel parity effect in spin dynamics is reported. Even-numbered chains are found to exhibit significantly faster spin switching than odd-numbered counterparts. Moreover, at certain parameters of the system the dimerization effect in the spin dynamics of the chains was found. Our studies give a clear evidence that tailoring spin dynamics and entanglement can be achieved by magnetic fields and by tuning exchange interactions in supported chains.
Highlights
The emerging field of quantum engineering has the potential to create new quantum technologies
In all above mentioned experiments, spin chains on CuN2 were created in control way by atomic manipulation with scanning tunnelling microscopy (STM)
There is another copper nitride insulating layer studied by STM - a self-corrugated Cu3N nitride phase on a Cu(110) surface, which forms a covalently polar bonded molecular network similar to the copper nitride (CuN2) on a Cu(001) surface[23]
Summary
Our recent ab initio and quantum spin Hamiltonian studies have predicted that these antiferromagnetically coupled spin chains on Cu3N can exhibit the quantum entanglement up to rather high temperature (20–100 K)[2]. Combining ab initio and quantum spin Hamiltonian studies, we demonstrate that antiferromagnetically coupled Con chains of various lengths (n - number of cobalt atoms) on a Cu3N/Cu(110) can be used for a fast spin switching and generation of entanglement by the external magnetic pulses. It is shown that propagation of this entanglement through cobalt chains can be tailored effectively by magnetic pulses and by tuning the exchange interactions between atomic spins. Our results indicate that engineering of spin switching and entanglement in atom-by-atom fashion can be achieved by exploiting the parity effect of an even- and odd-numbered Con chains, which exhibit significantly different quantum states. Our results offer a promising way to design spin-information transfer and entanglement of spin qubits based on atomic spin chains on insulating supports
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