Figure 5. Schematic overview of the experimental sequence.

The state is produced via a spin dynamics process at time t₁. The remaining condensate in the m_F=0 state acts as the local oscillator and has a phase imprinted on it by an energy shift of the m_F=−1 state relative to the m_F=1 state. This phase accumulates during time t₂ with 500 Hz. At time t₃ a radiofrequency pulse couples the m_F=0 condensate to the m_F=±1 states. This coupling acts as a three port beam splitter. An inhomogeneous magnetic field is applied at t₄ before the absorption detection is performed at t₅. A microwave dressing shifts the energy of the m_F=−1 state during the spin dynamics time t₁ and the radio-frequency coupling t₃.