Phase difference measurement device, measurement method, and electrical equipment comprising same

A phase difference measurement device, comprising:

• an electromagnetic irradiation unit, repeatedly irradiating a quantum sensor element with electromagnetic waves for manipulating an electron spin state of the quantum sensor element which changes via interaction with a first physical field or a second physical field generated by an alternating current (AC) signal;
• and
• a phase difference measurement unit, acquiring a plurality of the electron spin states after the interaction with the first physical field or the second physical field, and measuring a phase difference between a plurality of physical fields based on the plurality of the electron spin states acquired, wherein
• the phase difference measurement unit comprises
• a first physical field phase calculation unit that calculates a phase of the first physical field based on the plurality of the electron spin states after the interaction with the first physical field, and
• a second physical field phase calculation unit that calculates a phase of the second physical field based on the plurality of the electron spin states after the interaction with the second physical field, and
• measures the phase difference based on the phase of the first physical field calculated and the phase of the second physical field calculated.