State permutations from manipulation of near level-crossings

通过六方氮化硼中硼空位缺陷基态能级反交叉实现鲁棒的核自旋极化

Robust Nuclear Spin Polarization via Ground-State Level Anti-Crossing of Boron Vacancy Defects in Hexagonal Boron Nitride

本研究提出利用基态能级反交叉（GSLAC）技术在六方氮化硼的硼空位缺陷中实现核自旋极化，该方法所需激光功率显著低于激发态方法，并实现了核自旋的直接光学读出，为精确操控核自 spin提供了可行方案。

Tunable Quantum Beam Splitters for Coherent Manipulation of a Solid-State Tripartite Qubit System

Coherent control of quantum states is at the heart of implementing solid-state quantum processors and testing quantum mechanics at the macroscopic level. Despite significant progress made in recent years in controlling single- and bi-partite quantum systems, coherent control of quantum wave function in multipartite systems involving artificial solid-state qubits has been hampered due to the relatively short decoherence time and lacking of precise control methods. Here we report the creation and coherent manipulation of quantum states in a tripartite quantum system, which is formed by a superco…

Impact of the valley degree of freedom on the control of donor electrons near a Si/SiO_2 interface

We analyze the valley composition of one electron bound to a shallow donor close to a Si/barrier interface as a function of an applied electric field. A full six-valley effective mass model Hamiltonian is adopted. For low fields, the electron ground state is essentially confined at the donor. At high fields the ground state is such that the electron is drawn to the interface, leaving the donor practically ionized. Valley splitting at the interface occurs due to the valley-orbit coupling, V_vo^I = |V_vo^I| e^{i theta}. At intermediate electric fields, close to a characteristic shuttling field, …

表面上原子自旋的电可调量子干涉

Electrically tunable quantum interference of atomic spins on surfaces

本研究通过扫描隧道显微镜中的电场调控原子自旋间的磁相互作用，实现了单自旋和耦合自旋对的LZSM量子干涉，为强驱动下全电学量子操控开辟了新途径。