Many-body spin rotation by adiabatic passage in spin-1/2 XXZ chains of ultracold atoms
Many-body spin rotation by adiabatic passage in spin-1/2 XXZ chains of ultracold atoms
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DOI：
10.1088/2058-9565/acd2fb
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发表时间：
2022-12
影响因子：
6.7
通讯作者：
Ivana Dimitrova;S. Flannigan;Yoo Kyung Lee;Han-Hsin Lin;J. Amato-Grill;Niklas Jepsen;Ieva Čepaitė;A. Daley;W. Ketterle
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作者：
Ivana Dimitrova;S. Flannigan;Yoo Kyung Lee;Han-Hsin Lin;J. Amato-Grill;Niklas Jepsen;Ieva Čepaitė;A. Daley;W. Ketterle
量子多体相具有独特的性质和涌现现象，使其成为一个活跃的研究领域。在模型系统中实验实现的一种有前途的方法是绝热地跟踪量子哈密顿量的基态，从孤立粒子的乘积态到强相关的乘积态。此类协议在相干量子退火和绝热量子计算中也具有更广泛的相关性。在这里，我们在光学晶格中的超冷原子系统中探索了一种这样的协议。完全磁化状态通过多体自旋旋转连接到相关的零磁化状态（xy 铁磁体），这是通过扫描微波场的失谐和功率来实现的。通过应用具有可变相对相位的反向扫描来表征效率。我们恢复了高达 50% 的原始磁化强度，与相对相位无关，这是相关性形成的证据。该协议受到最终状态的多体间隙的限制，该间隙与系统规模和技术噪声成反比。我们的实验和理论研究强调了绝热制备方案制备自旋哈密顿量多体本征态的潜力和挑战。
Quantum many-body phases offer unique properties and emergent phenomena, making them an active area of research. A promising approach for their experimental realization in model systems is to adiabatically follow the ground state of a quantum Hamiltonian from a product state of isolated particles to one that is strongly-correlated. Such protocols are relevant also more broadly in coherent quantum annealing and adiabatic quantum computing. Here we explore one such protocol in a system of ultracold atoms in an optical lattice. A fully magnetized state is connected to a correlated zero-magnetization state (an xy-ferromagnet) by a many-body spin rotation, realized by sweeping the detuning and power of a microwave field. The efficiency is characterized by applying a reverse sweep with a variable relative phase. We restore up to 50% of the original magnetization independent of the relative phase, evidence for the formation of correlations. The protocol is limited by the many-body gap of the final state, which is inversely proportional to system size, and technical noise. Our experimental and theoretical studies highlight the potential and challenges for adiabatic preparation protocols to prepare many-body eigenstates of spin Hamiltonians.