Nuclear spin-wave quantum register for a solid-state qubit

Quantum Logic Enhanced Sensing in Solid-State Spin Ensembles

“…Integrating additional quantum degrees of freedom, e.g., defects with couplings to multiple nuclear spins, is another promising direction for further progress in QLE sensing [34][35][36][37]. Similarly, solutions to address the random distribution of host lattice nuclear spins, such as manipulating the collective modes of a spin bath [38], may prove advantageous when exploring more advanced quantum logic or error correction algorithms [39]…”

Cavity-enhanced quantum network nodes

“…Thus, using the electronic spin of Kramers dopants in quantum network nodes only seems promising at ultralow concentrations Dantec et al, 2021). As an alternative, long-lived quantum states can be encoded in the nuclear rather than electronic spin of the dopant (Kindem et al, 2020;Ortu et al, 2018;Rakonjac et al, 2020;Rančić et al, 2018;Ruskuc et al, 2022). To this end, the electronic spin of Kramers dopants can also be frozen to the ground state at low temperature ( 2 K) and large magnetic fields ( 3 T).…”

“…This can be achieved by integrating the emitters into optical resonators. Recent experiments with nanophotonic structures have resolved single dopants (Dibos et al, 2018;Xia et al, 2021;Zhong et al, 2018), implemented single-shot readout (Kindem et al, 2020;Raha et al, 2020) and nuclear spin registers (Ruskuc et al, 2022), and demonstrated frequencydomain multiplexing and simultaneous control of several dopants (Chen et al, 2020;Ulanowski et al, 2021). In these experiments, Purcell enhancement factors between 100 and 1000 have been achieved, reducing the optical lifetime to a few µs.…”

Nuclear spin polarization and control in a van der Waals material

“…Different from diamond which has sparse nuclear spins [32], all atoms in hBN have non-zero nuclear spins. Because they have longer coherence times than those of electron spins, nuclear spins are promising resources for quantum sensing, network, computing and simulation if they can be polarized and coherently controlled [15,[32][33][34].…”

“…We also demonstrate MHz fast coherent control of the nuclear spins with hyperfine enhancement. The polarized nuclear spins in vdW materials will have potential applications in quantum sensing, network, computing and simulation [13][14][15][32][33][34]. Nitrogen nuclear spins in the triangle lattice in hBN will be suitable for large-scale quantum simulation of different magnetic states [15], including spin liquids [11,12].…”