Matter-wave interferometers using TAAP rings

New Journal of Physics   18   075014 (2016)

P. Navez, S. Pandey, H. Mas, K. Poulios, T. Fernholz, and W. von Klitzing

doi: 10.1088/1367-2630/18/7/075014

Fig 2

Figure 2. Experimental realisation of a ring-shaped TAAP waveguide (s = 0, d = 0) with rubidium atoms in the ∣2, +2ñ state. The quadrupole gradient is a = 50 G cm−1 with wrf 2p = 2.62 MHz. The measured Rabi frequency is Wrf 2p = 215 kHz. The radius of the ring is R = 570 μm.

Abstract: We present two novel matter-wave Sagnac interferometers based on ring-shaped time-averaged adiabatic potentials, where the atoms are put into a superposition of two different spin states and manipulated independently using elliptically polarized rf-fields. In the first interferometer the atoms are accelerated by spin-state-dependent forces and then travel around the ring in a matter-wave guide. In the second one the atoms are

Figure 6.

Figure 6. Experimental realisation of arbitrary traps with (s 1 0, d 1 0) for the two states ∣2, +2ñ (5 × 105 atoms) and ∣1, -1ñ (3 × 105 atoms) at wrf 2p = 2.62 MHz . The fitted radius is 440 μm and 450 μm respectively. The quadrupole gradient is
a = 55 G cm−1. Note that (a) and (b) are taken with identical experimental conditions and differ only in the state of the atoms. The axis of the circular rf component and the one of the tilted modulation are not orthogonal.

fully trapped during the entire interferometric sequence and are moved around the ring in two spin-state-dep
endent `buckets’. Corrections to the ideal Sagnac phase are investigated for both cases. We experimentally demonstrate the key atom-optical elements of the interferometer such as the independent manipulation of two different spin states in the ring-shaped potentials under identical experimental conditions.