Magnetic field measurement apparatus and magnetic field measurement method

A magnetic field measurement apparatus, comprising:

• a magnetic resonance member configured to perform an electron spin quantum operation in response to an application of a microwave;
• a high-frequency magnetic field generator that applies the microwave to the magnetic resonance member;
• a magnet that applies a static magnetic field to the magnetic resonance member;
• an irradiating device that irradiates the magnetic resonance member with incident light of a specific wavelength;
• a flux transformer that senses a measurement target magnetic field using a primary coil and applies an application magnetic field corresponding to the sensed measurement target magnetic field to the magnetic resonance member using a secondary coil;
• a first light guide member that guides the incident light to the magnetic resonance member;
• and
• a second light guide member that guides from the magnetic resonance member fluorescence that the magnetic resonance member emits;
• wherein the magnetic resonance member is arranged between an end surface of the first light guide member and an end surface of the second light guide member in a hollow part of the secondary coil of the flux transformer and in a hollow part of the magnet.