Quantum Vector Signal Analyzer: Wideband Electric Field Sensing via Motional Raman Transitions
arXiv:2311.12263 · doi:10.1038/s41567-024-02753-0
Abstract
Ultrasensitive detection of the frequency, phase, and amplitude of radio frequency (RF) electric fields is central to a variety of important applications, including radio communication, cosmology, dark matter searches, and high-fidelity qubit control. Quantum harmonic oscillator (QHO) systems, especially trapped ions, have been used with several quantum sensing techniques to achieve electric field sensing with state-of-the-art sensitivity and nanometer spatial resolution. However, these systems are limited to a narrow frequency range centered around either the motional frequency of the trapped ion oscillator or the frequency of an optical transition in the ion; often these techniques are not sensitive to the RF phase. Here, we propose and demonstrate a procedure that unlocks the extreme sensitivity of a QHO to allow high precision wideband detection of the frequency, phase, and amplitude of an unknown electric field. Specifically, we use motional Raman transitions in a single trapped ion, cooled near its motional ground state to realize state of the art sensitivities to frequency, phase, and amplitude, and show the technique works over a frequency range that is >800x larger than previous techniques. Further, this technique is shown to be compatible with both quantum amplification via squeezing and measurement in the Fock basis, allowing performance 3.4(20) dB below the standard quantum limit and the potential for several orders of magnitude improvement in sensitivity with moderate upgrades. In addition to providing an attractive platform for quantum sensing of small fields, this technique allows in situ calibration of qubit control lines in QHO systems, as well as transduction of external, non-resonant drives into oscillator excitation. Additionally, this approach can be extended to other QHO systems, such as a superconducting qubit-resonator system.
24 pages; 4 figures in the main text, 10 figures and 2 tables in the SI
References in corpus (24)
- Quantum sensing
- Quantum-enhanced measurements: beating the standard quantum limit
- Quantum metrology with nonclassical states of atomic ensembles
- Quantum state engineering on an optical transition and decoherence in a Paul trap
- Quantum-enhanced sensing of displacements and electric fields with large trapped-ion crystals
- Quantum amplification of mechanical oscillator motion
- Assessment of Rydberg Atoms for Wideband Electric Field Sensing
- Quantum-enhanced sensing of a mechanical oscillator
- Motional Fock states for quantum-enhanced amplitude and phase measurements with trapped ions
- Robust and resource-efficient microwave near-field entangling Be gate
- Highly sensitive measurement of a megahertz rf electric field with a Rydberg-atom sensor
- Trapped Ion Quantum Information Processing with Squeezed Phonons
- Experimental Preparation of High NOON States for Phonons
- Entanglement-enhanced detection of single-photon scattering events
- Quantum-enhanced metrology with large Fock states
- Amplitude sensing below the zero-point fluctuations with a two-dimensional trapped-ion mechanical oscillator
- Nanoscale Electric Field Imaging with an Ambient Scanning Quantum Sensor Microscope
- In situ characterization of qubit control lines: a qubit as a vector network analyzer
- Quantum oscillator noise spectroscopy via displaced cat states
- Phase-coherent sensing of the center-of-mass motion of trapped-ion crystals
- Quantum harmonic oscillator spectrum analyzers
- Experimental speedup of quantum dynamics through squeezing
- Data processing over single-port homodyne detection to realize super-resolution and super-sensitivity
- In-situ characterization of qubit drive-phase distortions