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We demonstrate that a nitrogen-vacancy (NV) center in diamond can be used as a nanoscale quantum sensor for detecting photonic spin density (PSD). This opens a new frontier for studying exotic phases of photons as well as future on-chip applications.

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Generation of a local magnetic field at the nanoscale is desirable for many applications such as spin-qubit-based quantum memories. However, this is a challenge due to the slow decay of static magnetic fields. Here, we demonstrate a photonic spin density (PSD)-induced effective static magnetic field for an ensemble of nitrogen-vacancy (NV) centers in bulk diamond. This locally induced magnetic field is a result of coherent interaction between the optical excitation and the NV centers. We demonstrate an optically induced spin rotation on the Bloch sphere exceeding 10 degrees which has potential applications in all-optical coherent control of spin qubits.

We demonstrate a room-temperature optically induced magnetic field for nitrogen-vacancy centers in diamond. The effective magnetic field i s d etermined b y the photonic spin density of a red-detuned optical excitation. This opens a new frontier for studying exotic phases of photons as well as future on-chip applications.