Magnetic field stabilization system for atomic physics experiments

Abstract

Atomic physics experiments commonly use millitesla-scale magnetic fields to provide a quantization axis. As atomic transition frequencies depend on the amplitude of this field, many experiments require a stable absolute field. Most setups use electromagnets, which require a power supply stability not usually met by commercially available units. We demonstrate stabilization of a field of 14.6 mT to 4.3 nT rms noise (0.29 ppm), compared to noise of $\gtrsim$ 100 nT without any stabilization. The rms noise is measured using a field-dependent hyperfine transition in a single ${}^{43}$Ca${}^{+}$ ion held in a Paul trap at the centre of the magnetic field coils. For the ${}^{43}$Ca${}^{+}$ "atomic clock" qubit transition at 14.6 mT, which depends on the field only in second order, this would yield a projected coherence time of many hours. Our system consists of a feedback loop and a feedforward circuit that control the current through the field coils and could easily be adapted to other field amplitudes, making it suitable for other applications such as neutral atom traps.

6 pages, 5 figures

References in corpus (18)

• Experimental issues in coherent quantum-state manipulation of trapped atomic ions
• Keeping a Quantum Bit Alive by Optimized $\pi$-Pulse Sequences
• High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit
• Ion-trap measurements of electric-field noise near surfaces
• Long-lived qubit memory using atomic ions
• Microwave quantum logic gates for trapped ions
• The Ion Trap Quantum Information Processor
• Coherence in Microchip Traps
• Dynamical decoupling sequence construction as a filter-design problem
• Multi-Element Logic Gates for Trapped-Ion Qubits
• Coherence of qubits based on single Ca${}^{+}$ ions
• A long-lived Zeeman trapped-ion qubit
• Hybrid quantum logic and a test of Bell's inequality using two different atomic isotopes
• Qubit metrology of ultralow phase noise using randomized benchmarking
• Cryogenic setup for trapped ion quantum computing
• Stability of a trapped atom clock on a chip
• Keeping a Single Qubit Alive by Experimental Dynamic Decoupling
• Cryogenic silicon surface ion trap

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