Quantum sensing of a coherent single spin excitation in a nuclear ensemble

Abstract

The measurement of single quanta in a collection of coherently interacting objects is transformative in the investigations of emergent quantum phenomena. An isolated nuclear-spin ensemble is a remarkable platform owing to its coherence, but detecting its single spin excitations has remained elusive. Here, we use an electron spin qubit in a semiconductor quantum dot to sense a single nuclear-spin excitation (a nuclear magnon) with 1.9-ppm precision via the 200-kHz hyperfine shift on the 28-GHz qubit frequency. We demonstrate this single-magnon precision across multiple modes identified by nuclear species and polarity. Finally, we monitor the coherent dynamics of a nuclear magnon and the emergence of quantum correlations competing against decoherence. A direct extension of this work is to probe engineered quantum states of the ensemble including long-lived memory states.

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• Driven dynamics of a quantum dot electron spin coupled to bath of higher-spin nuclei
• Wavelet-resolved coherence beats in the Overhauser field of a thermal nuclear spin ensemble
• Laser Cooling of Nuclear Magnons
• Two-photon Interface of Nuclear Spins Based on the Opto-Nuclear Quadrupolar Effect
• Quantum Sensing with Topological-Paired Bound States
• Proximal quantum control of spin and spin ensemble with highly localized control field from skyrmions
• Hilbert Space Fragmentation and Subspace Scar Time-Crystallinity in Driven Homogeneous Central-Spin Models
• Atom-Mechanical Hong-Ou-Mandel Interference
• Noise-resistant quantum memory enabled by Hamiltonian engineering
• Entangling nuclear spins in distant quantum dots via an electron bus
• Slowly generated anomalously large nuclear field in bulk n-AlGaAs
• Quantifying electron-nuclear spin entanglement dynamics in central-spin systems using one-tangles
• Dynamical nuclear spin polarization in a quantum dot with an electron spin driven by electric dipole spin resonance