Multi-second magnetic coherence in a single domain spinor Bose-Einstein condensate

Abstract

We describe a compact, robust and versatile system for studying magnetic dynamics in a spinor Bose-Einstein condensate. Condensates of 87 Rb are produced by all-optical evaporation in a 1560 nm optical dipole trap, using a non-standard loading sequence that employs an auxiliary 1529 nm beam for partial compensation of the strong differential light shift induced by the dipole trap itself. We use near-resonance Faraday rotation probing to non-destructively track the condensate magnetization, and demonstrate few-Larmor-cycle tracking with no detectable degradation of the spin polarization. In the ferromagnetic F = 1 ground state, we observe magnetic T1 and T2${}^{\ast }$ coherence times limited only by the several-second residence time of the atoms in the trap.

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Cited by in corpus (12)

• Quantum limits to the energy resolution of magnetic field sensors
• Criticality-enhanced quantum sensing in ferromagnetic Bose-Einstein condensates: role of readout measurement and detection noise
• Surpassing the Energy Resolution Limit with ferromagnetic torque sensors
• Single-domain Bose condensate magnetometer achieves energy resolution per bandwidth below $\hslash$
• Bose-Einstein Condensate Comagnetometer
• Critical quantum thermometry and its feasibility in spin systems
• Spatially-selective in situ magnetometry of ultracold atomic clouds
• Maltese cross coupling to individual cold atoms in free space
• Dynamics of an itinerant spin-3 atomic dipolar gas in an optical lattice
• Stoner-Wohlfarth switching of the condensate magnetization in a dipolar spinor gas and the metrology of excitation damping
• Single-shot Stern-Gerlach magnetic gradiometer with an expanding cloud of cold cesium atoms
• Interferometric measurement of interhyperfine scattering lengths in ${}^{87}$Rb