Technique - (34) Hahn echo / dynamical decoupling

Type: Experimental

Description: Spin-echo pulse sequences (Hahn, CPMG, XY-8) for coherence extension and AC field sensing.

Department(s)/lab(s): Physics (Cavendish Laboratory – AMOP Group) | Quantum Optical Materials and Systems (QOMS) @ Cambridge
Summary:

AtatΓΌre leads the ~30-person QOMS group at the Cavendish. Three main thrusts: (1) Spin-based quantum networks β€” demonstrating distant entanglement generation and photonic cluster states using semiconductor quantum dots (InGaAs, GaAs) and diamond spin defects (NV, SiV, SnV), including a many-body nuclear-spin quantum register demonstrated in 2025 (Nature Physics); (2) Quantum-enhanced nanoscale sensing β€” scanning NV diamond magnetometry of emergent magnetism in novel 2D/layered materials and quantum transport in nanocircuits, plus nanodiamond-based in-cell sensing (nanoMRI, thermometry, diffusion in C. elegans); (3) Novel quantum materials β€” hexagonal boron nitride (hBN) optically-active spin defects at room temperature, and moirΓ© physics in TMD heterostructures. He is co-founder and CSO of Nu Quantum Ltd.

Department(s)/lab(s): Physics / PME | Awschalom Group @ UChicago
Summary:

Pioneer in spintronics and quantum information engineering. Research spans: (1) NV-center spin qubits in diamond for quantum sensing and communication including nanomagnetic imaging; (2) spin defects in SiC and Er-doped hosts for quantum network nodes at telecom wavelengths; (3) molecular and protein-based spin qubits (2025 fluorescent-protein spin qubit, Physics World Top-10); (4) coherent Er spin defects in colloidal nanocrystal hosts (2024, with Alivisatos). Founding Director Chicago Quantum Exchange. Joint Senior Scientist Argonne. Large infrastructure-rich group with strong industry ties (IBM, Intel, Google quantum).

Department(s)/lab(s): School of Physics | Quantum Integration Laboratory @ USyd
Summary:

Bartholomew trained with Sellars (ANU) and Faraon (Caltech) and runs the Quantum Integration Laboratory, which works on rare-earth ions (erbium, europium, ytterbium) in crystals and in nanophotonic devices. Rare-earth ions have the longest optical and spin coherence times of any solid-state emitter, which makes them simultaneously the best optical quantum memories and, less obviously, extremely good sensors: the group works on rare-earth-based microwave and RF quantum sensing, on-chip integration of ions with photonic and superconducting circuits, and telecom-band spin-photon interfaces. Positioned against the established body of NV-ensemble quantum sensing work β€” DEER, nanoscale NMR and T1 relaxometry protocols operating at pT/sqrt(Hz) field sensitivity β€” rare-earth ensembles are the closest solid-state analogue to NV ensembles, with narrower optical lines and longer coherence but cryogenic operation; protocols like DEER and dynamical-decoupling-enhanced sensing at pT/sqrt(Hz) map across directly. This is one of the best fits at Sydney for a solid-state spin-sensing candidate.

Department(s)/lab(s): Physics / Niels Bohr Institute | BendixLab β€” Biophotonics & Mechanobiology @ UCPH
Summary:

Poul Martin Bendix (Associate Professor, BendixLab/NBI) investigates physical properties of living cells using advanced optical techniques. Research: (1) optical tweezers for mechanosensing β€” GPCR mechanosensing with picoNewton force resolution, membrane curvature sensing by proteins (annexins, BAR-domain proteins); (2) thermoplasmonics β€” gold nanoparticle laser heating for controlled membrane microsurgery, cell fusion, and plasma membrane repair; (3) single-molecule biophysics β€” DNA-protein interactions using 4-trap optical tweezers (LUMICKS C-Trap) with STED imaging; (4) filopodia dynamics β€” twist and rotation of actin filaments; (5) Brillouin microscopy for cell mechanics; (6) COBM center management. GPCRmec consortium (Novo Nordisk). 2026 BPS Annual Meeting featured.

Department(s)/lab(s): School of Physics | Quantum Control Laboratory @ USyd
Summary:

Biercuk's Quantum Control Laboratory sits precisely at the intersection of control engineering and precision measurement. The group uses trapped ytterbium ions β€” including large 2D Penning-trap crystals β€” as both quantum simulators and as calibrated sensors, and is best known for noise spectroscopy: using the qubit itself as a spectrum analyser of its environment, then designing dynamical-decoupling and open-loop control sequences that null the dominant noise. That programme produced Q-CTRL, his quantum control software company, and more recently a serious push into quantum sensing for navigation (magnetic anomaly navigation, quantum-enhanced RF sensing) as a commercial and defence application. Positioned against the established body of NV-ensemble quantum sensing work β€” DEER, nanoscale NMR and T1 relaxometry protocols operating at pT/sqrt(Hz) field sensitivity β€” his filter-function and noise-spectroscopy formalism is now standard equipment in the NV community for designing the DEER and dynamical-decoupling sequences that deliver pT/sqrt(Hz) sensitivity; a candidate from that background would find the theoretical toolkit immediately familiar. Large, well-funded group with strong industry pathways.

Department(s)/lab(s): Physics | Quantum Engineering Group (Cappellaro Lab) @ MIT
Summary:

PREFERRED. Cappellaro pioneered quantum magnetic sensing with electronic spin defects (NV centers) in diamond, and her group designs and controls solid-state spin qubit systems for quantum sensing, simulation, and quantum information processing, combining theoretical insight into spin dynamics with experimental control of dynamical decoupling and nuclear-spin registers for nanoscale NMR. This builds on the broader lineage of NV ensemble quantum sensing (DEER, NMR, T1 relaxometry) that has pushed AC/DC magnetic sensitivities toward the pT/sqrt(Hz) regime, which her group's Hamiltonian-engineering and nuclear-spin-register approaches aim to extend further.

Department(s)/lab(s): Electrical Engineering | Choi Lab @ Stanford
Summary:

Choi builds large-scale, individually addressable arrays of solid-state spin qubits (NV centers and related defects) and entangles ancilla nuclear/electronic spins to demonstrate high-precision, entanglement-enhanced quantum sensing, extending the ensemble NV magnetometry regime (DEER/T1 protocols at pT/√Hz) toward single- and few-spin sensors with quantum-error-corrected readout.

Department(s)/lab(s): Physics – Laboratory for Solid State Physics | Degen Group (Spin Physics and Imaging) @ ETH Zurich
Summary:

Degen leads the Spin Physics and Imaging group, one of the world's leading NV-center magnetometry labs. Research directions (as of 2025): (1) Scanning NV magnetometry of quantum materials β€” NV-tipped cantilevers image current flow (≲50 nm resolution) in graphene heterostructures and resolve domain walls in antiferromagnets/ferroelectrics; cryogenic scanning down to 350 mK in dilution refrigerator (published Appl. Phys. Lett. 2022). (2) Single-molecule NMR β€” shallow NV centers detect nuclear spins from surface-adsorbed molecules with sub-nanometer 3D resolution; 2022 Nano Lett. on amine-functionalized diamond surfaces; exploring chirality-induced spin selectivity at few-molecule level. (3) NV magnetometry protocols β€” reconstruction-free waveform sensing (1.1 ns time resolution, Nature 2025), gradiometric detection, spectrum demodulation for rapid scanning, multi-NV addressing. (4) Diamond nanoengineering β€” multicone pillar waveguides, surface engineering, scanning probe fabrication. ERC Proof-of-Concept 2025 for photonic IC single-photon NV excitation/detection for commercial quantum sensing.

Department(s)/lab(s): BioNanoscience / Kavli Institute of Nanoscience | Marileen Dogterom Lab β€” Cytoskeleton & Cell Biophysics @ TU Delft
Summary:

Marileen Dogterom (Full Professor, BioNanoscience) studies cytoskeleton dynamics and synthetic cell construction. Research: (1) microtubule dynamics β€” force generation, catastrophe control, and mitotic spindle assembly reconstituted in vitro; (2) cell division reconstitution β€” building minimal synthetic cells with controlled division; (3) optical tweezers and fluorescence microscopy for force measurement on single cytoskeletal elements. Co-founded BioNanoscience department.

Department(s)/lab(s): School of Electrical Engineering and Telecommunications | Dzurak Silicon Quantum Devices Group @ UNSW
Summary:

Dzurak leads the silicon CMOS quantum dot spin qubit programme at UNSW and co-founded Diraq, the company commercialising it. The group demonstrated the first silicon MOS qubit, two-qubit logic in silicon, and has pushed toward fidelities above the fault-tolerance threshold in industrially-manufactured CMOS devices, including work on gate-stack engineering for low charge noise and on single-electron-transistor charge sensing for readout. Positioned against the established body of NV-ensemble quantum sensing work β€” DEER, nanoscale NMR and T1 relaxometry protocols operating at pT/sqrt(Hz) field sensitivity β€” the relevant transferable asset is the readout: the single-electron-transistor and gate-based dispersive sensors this group builds are among the most sensitive electrometers in existence, the charge-domain analogue of pT/sqrt(Hz) magnetometry. Caveat against the stated preference: the programme is now heavily fabrication- and yield-driven and closely tied to a commercial roadmap, so a sensing-focused postdoc would be somewhat off the group's main axis.