We propose a quantum speedup method for adiabatic generation of cat states in bosonic Josephson junctions via shortcuts to adiabaticity. We apply approximated counter-diabatic driving to a bosonic Josephson junction using the Holstein-Primakoff transformation. In order to avoid the problem of divergence in counter-diabatic driving, we take finite-size corrections into account. The resulting counter-diabatic driving is well-defined over whole processes. Schedules of the counter-diabatic driving consist of three steps; the counter-diabatic driving in the disordered phase, smoothly and slowly approaching the critical point, and the counter-diabatic driving in the ordered phase. Using the counter-diabatic driving, adiabatic generation of cat states is successfully accelerated. The enough large quantum Fisher information ensures that generated cat states are highly entangled.
A Shortcut from Categorical Quantum Theory to Convex Operational Theories
本文描绘了一个非常直接的路径之间的分类方法的量子力学,由于阿布拉姆斯基和Coecke,和旧的凸运算方法的基础上有序向量空间(最近化身为“广义概率理论”)。在前者中,对称么半群范畴C的对象被理解为表示物理系统和态射、物理过程。幺半群C(I,I)的元素在某种程度上被隐喻地解释为概率。对称么半群范畴C的标量的任何么半群同态都产生一个从C到序向量空间对偶范畴的协变函子V_o。从V_o到1的自然变换u(其中1是平凡的这种函子)允许我们识别规范化状态,因此,将图像范畴V_o(C)视为由具体的操作模型组成。在这种情况下,如果A和B是C中的对象,则V_o(A x B)定义V_o(A)和V_o(B)的非信令复合。如果C满足“局部层析成像”条件,或者C是紧闭的,这就在象范畴上定义了一个对称monoidal结构,并使V_o成为一个(严格)monoidal函子。
Topologically protected Bell-cat states in a simple spin model
McMaster University(麦克马斯特大学);Perimeter Institute for Theoretical Physics(珀蒂默理论物理研究所);The University of Oklahoma(俄克拉荷马大学);University of Victoria(维多利亚大学)
Engineering multi-photon dissipation with a dc-voltage-biased Josephson junction
École Normale Supérieure de Lyon(里昂高等师范学院);CNRS(法国国家科学研究中心);Laboratoire de Physique(物理实验室);Alice & Bob;Mines Paris(巴黎矿业学院);Inria(法国国家信息与自动化研究所);ENS-PSL(巴黎高等师范学院-PSL大学);Centre Automatique et Systèmes (CAS)(自动系统与中心);Sorbonne Université(索邦大学);PSL Research University(PSL研究大学)
Engineering dissipation and control pulses for high-fidelity fault-tolerance quantum computing
Fujian Key Laboratory of Quantum Information and Quantum Optics, Fuzhou University(福州大学);Department of Physics, Fuzhou University(福州大学);Quantum Information Physics Theory Research Team, Center for Quantum Computing, RIKEN(理化学研究所);Institute of Quantum Science and Technology, Yanbian University(延边大学)
Motional Kerr-Cat States of an Atom in an Optical Tweezer
JILA, NIST and University of Colorado(JILA、美国国家标准与技术研究院和科罗拉多大学);Department of Physics, University of Colorado(科罗拉多大学物理系);Center for Theory of Quantum Matter, University of Colorado(科罗拉多大学量子物质理论中心);Joint Center for Quantum Information and Computer Science, NIST and University of Maryland(量子信息与计算机科学联合中心、美国国家标准与技术研究院和马里兰大学);Joint Quantum Institute, NIST and University of Maryland(量子研究所、美国国家标准与技术研究院和马里兰大学);Institut Quantique, Université de Sherbrooke(舍布鲁克大学量子研究所)