Qubit Control Limited by Spin鈥揕attice Relaxation in a Nuclear Spin-Free Iron(III) Complex

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• 作者：Joseph M. Zadrozny ; Danna E. Freedman
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：December 21, 2015
• 年：2015
• 卷：54
• 期：24
• 页码：12027-12031
• 全文大小：305K
• ISSN：1520-510X

文摘

High-spin transition metal complexes are of interest as candidates for quantum information processing owing to the tunability of the pairs of M_S levels for use as quantum bits (qubits). Thus, the design of high-spin systems that afford qubits with stable superposition states is of primary importance. Nuclear spins are a potent instigator of superposition instability; thus, we probed the Ph₄P⁺ salt of the nuclear spin-free complex [Fe(C₅O₅)₃]^{3鈥?/sup> (1) to see if long-lived superpositions were possible in such a system. Continuous-wave and pulsed electron paramagnetic resonance (EPR) spectroscopic measurements reveal a strong EPR transition at X-band that can be utilized as a qubit. However, at 5 K the coherent lifetime, T₂, for this resonance is 721(3) ns and decreases rapidly with increasing temperature. Simultaneously, the spin鈥搇attice relaxation time is extremely short, 11.33(1) 渭s, at 5 K, and also rapidly decreases with increasing temperature. The coincidence of these two temperature-dependent data sets suggests that T₂ in 1 is strongly limited by the short T₁. Importantly, these results highlight the need for new design parameters in pursuit of high-spin species with appreciable coherence times.}