Coherence limits in lattice atom interferometry at the one-minute scale

• URL: http://arxiv.org/abs/2210.07289v3
• Date: Wed, 12 Jun 2024 17:14:09 GMT
• Title: Coherence limits in lattice atom interferometry at the one-minute scale
• Authors: Cristian D. Panda, Matthew Tao, James Egelhoff, Miguel Ceja, Victoria Xu, Holger Müller,
• Abstract summary: In atom interferometry, the non-classical state is a spatial superposition, where each atom coexists in multiple locations. In atom interferometers, the available interrogation time is limited to around 3 seconds for a 10 m fountain. Here, we realise an atom interferometer with a spatial superposition state that is maintained for as long as 70 seconds.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In quantum metrology and quantum simulation, a coherent non-classical state must be manipulated before unwanted interactions with the environment lead to decoherence. In atom interferometry, the non-classical state is a spatial superposition, where each atom coexists in multiple locations as a collection of phase-coherent partial wavepackets. These states enable precise measurements in fundamental physics and inertial sensing. However, atom interferometers usually use atomic fountains, where the available interrogation time is limited to around 3 seconds for a 10 m fountain. Here, we realise an atom interferometer with a spatial superposition state that is maintained for as long as 70 seconds. We analyse the theoretical and experimental limits to coherence arising from collective dephasing of the atomic ensemble. This reveals that the decoherence rate slows down markedly at hold times that exceed tens of seconds. These gains in coherence may enable gravimetry measurements, searches for fifth forces or fundamental probes into the non-classical nature of gravity.

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