Dynamics of a macroscopic spin qubit in spin-orbit coupled Bose-Einstein condensates
arXiv:1505.04301 · doi:10.1088/0953-4075/48/11/115302
Abstract
We consider a macroscopic spin qubit based on spin-orbit coupled Bose-Einstein condensates, where, in addition to the spin-orbit coupling, spin dynamics strongly depends on the interaction between particles. The evolution of the spin for freely expanding, trapped, and externally driven condensates is investigated. For condensates oscillating at the frequency corresponding to the Zeeman splitting in the synthetic magnetic field, the spin Rabi frequency does not depend on the interaction between the atoms since it produces only internal forces and does not change the total momentum. However, interactions and spin-orbit coupling bring the system into a mixed spin state, where the total spin is inside rather than on the Bloch sphere. This greatly extends the available spin space making it three-dimensional, but imposes limitations on the reliable spin manipulation of such a macroscopic qubit. The spin dynamics can be modified by introducing suitable spin-dependent initial phases, determined by the spin-orbit coupling, in the spinor wave function.
15 pages, 8 figures
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Cited by in corpus (12)
- Spin-orbit coupled soliton in a random potential
- Dynamics of quantum soliton in Lee-Huang-Yang spin-orbit coupled Bose-Einstein condensates
- Inverse engineering for fast transport and spin control of spin-orbit-coupled Bose-Einstein condensates in moving harmonic traps
- Excitation spectra of a Bose-Einstein condensate with an angular spin-orbit coupling
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- Fast transport and splitting of spin-orbit-coupled spin-1 Bose-Einstein Condensates
- Entanglement like properties in Spin-Orbit Coupled Ultra Cold Atom and violation of Bell like Inequality
- Spin Hall mode in a trapped thermal Rashba gas