Phys.org January 24, 2022 Researchers in China implemented dissipative spin–orbit-coupled bands filled with ultracold fermions and observed parity-time symmetry breaking as a result of the competition between the spin–orbit coupling and dissipation. Tunable dissipation, introduced by state-selective atom loss, enabled them to tune the energy gap and close it at the critical dissipation value, the so-called exceptional point. Near the critical point, the state evolution exhibited a chiral response, which enabled them to tune the spin–orbit coupling and dissipation dynamically, revealing topologically robust chiral spin transfer when the quantum state encircled the exceptional point. According to the researchers this demonstrates […]
Tag Archives: Spin orbit coupling
Harnessing the power of ‘spin orbit’ coupling in silicon: Scaling up quantum computation
Science Daily December 7, 2018 Coupling spin qubits to electric fields is attractive for simplifying qubit manipulation and couple qubits over long distances. Electron spins in silicon offer long lifetimes, but their weak spin-orbit interaction makes electrical coupling challenging. An international team of scientists (Australia, France) has shown that boron and phosphorus atoms in silicon couple efficiently to electric fields, enabling rapid qubit manipulation and qubit coupling over large distances. Those bound to phosphorus donor qubits revealed a previously unknown coupling of the electron spin to the electric fields typically found in device architectures created by control electrodes. By careful […]