Non-inertial motion dependent Bell state

We investigate how non-inertial motion affects polarization entangled photonic Bell states. For this purpose, we combine a SPDC source with a rotating Sagnac interferometer. We then bring the photon pair in a superposition of co- and counter-rotation. The phase of this |Φ>-state corresponds to the Sagnac phase and is linearly dependent on the angular velocity. We can switch between a |Φ⁺>–state and a |Φ^->–state by changing the angular velocity. Thus, our setup enables a unitary transformation by means of rotation and a Bell state manipulation via non-inertial motion.