Phys.org October 2, 2024 Optically addressable spin defects in 3D crystals and 2D van der Waals (vdW) materials are important for nanoscale quantum sensing. However, optically detected magnetic resonance of localized spin defects in a nanotube has not been observed. A team of researchers in the US (Purdue University, Indiana University) found single spin color centers in boron nitride nanotubes (BNNTs) at room temperature which suggested that BNNT spin defects possess a spin S = 1/2 ground state without an intrinsic quantization axis, leading to orientation-independent magnetic field sensing. Using this unique feature, they observed anisotropic magnetization of a 2D […]
Category Archives: Quantum sensing
New quantum sensing scheme could lead to enhanced high-precision nanoscopic techniques
Phys.org May 4, 2024 Researchers in the UK developed a high sensitivity quantum sensing scheme for transverse displacement between two photons interfering at a balanced beam splitter. It is based on transverse-momentum sampling measurements at the output. They showed that their interferometric technique achieved the ultimate spatial precision in nature irrespective of the overlap of the two displaced photonic wave packets. The precision of the technique was marginally reduced when dealing with photons differing in nonspatial degrees of freedom. Their work could lead to enhanced high-precision nanoscopic techniques, such as super-resolved single-molecule localization microscopy with quantum dots, by circumventing the […]
Improving quantum sensors by measuring the orientation of coherent spins inside a diamond lattice
Phys.org June 16, 2022 Researchers in Japan have developed a new method for implementing magnetic field measurements in nitrogen-vacancy centers. The spin state of an extra electron at this site can be read or coherently manipulated using pulses of light. They used an “inverse Cotton-Mouton” effect to test their method. They used light of different polarizations to create tiny controlled local magnetic fields. They have demonstrated that by measuring the orientation of coherent spins inside a diamond lattice, the magnetic fields can be measured even over very short times. The team hopes that this work will help enable quantum spintronic […]
Breakthrough in quantum sensing provides new material to make qubits
Phys.org March 9, 2022 Being atomically thin and amenable to external controls, 2D materials offer a new paradigm for the realization of patterned qubit fabrication and operation at room temperature for quantum information sciences applications. An international team of researchers (USA – Temple University, Northeastern University, Taiwan) has shown that the antisite defect in 2D transition metal dichalcogenides (TMDs) can provide a controllable solid-state spin qubit system. Using high-throughput atomistic simulations, they identified several neutral antisite defects in TMDs that lie deep in the bulk band gap and host a paramagnetic triplet ground state. The analysis revealed the presence of […]