Quantum Coherence of Strongly Correlated Defects in Spin Chains

详细信息    查看全文

• 作者：Sylvain Bertaina^a ; ^{sylvain.bertaina@im2np.fr" class="auth_mail" title="E-mail the corresponding author} ; Charles-Emmanuel Dutoit^a ; Johan Van Tol^b ; Martin Dressel^c ; Bernard Barbara^d ; Anatoli Stepanov^a
• 关键词：Quantum coherence ; EPR ; strongly correlated magnet
• 刊名：Physics Procedia
• 出版年：2015
• 出版时间：2015
• 年：2015
• 卷：75
• 期：Complete
• 页码：23-28
• 全文大小：361 K

文摘

Most of qubit systems known to date are isolated paramagnetic centres in magnetically diluted samples since their dilution allows to considerably weaken the dipole-dipole inter-qubit interaction and thus to prevent the decoherence. Here we suggest an alternative approach for spin qubits which are built on spin S = 1/2 defects in magnetically concentrated strongly correlated systems - spin chains. The corresponding qubits are made of spin solitons resulting from local breaking of transitional symmetry associated with point-defects. We provide the first evidence for coherence and Rabi oscillations of spin solitons in isotropic Heisenberg chains, simple antiferromagnetic-Ńeel or spin-Peierls, proving that they can be manipulated as single spin S = 1/2. The entanglement of these many-body soliton states over macroscopic distances along chains gives rise to networks of coupled qubits which could easily be decoupled at will in extensions of this work.