Spatially Homogeneous Entanglement for Matter-Wave Interferometry Created with Time-Averaged Measurements

Abstract

We demonstrate a method to generate spatially homogeneous entangled, spin-squeezed states of atoms appropriate for maintaining a large amount of squeezing even after release into the arm of a matter-wave interferometer or other free space quantum sensor. Using an effective intracavity dipole trap, we allow atoms to move along the cavity axis and time average their coupling to the standing wave used to generate entanglement via collective measurements, demonstrating 11(1) dB of directly observed spin squeezing. Our results show that time averaging in collective measurements can greatly reduce the impact of spatially inhomogeneous coupling to the measurement apparatus.

arXiv commentSupplemental material included. 13 pages, 4 figures

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• Cavity-assisted preparation and detection of a unitary Fermi gas
• Quantum Enhanced Cavity QED Interferometer with Partially Delocalized Atoms in Lattices
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• Fast control of atom-light interaction in a narrow linewidth cavity
• Cavity probe for real-time detection of atom dynamics in an optical lattice
• Control and amplification of Bloch oscillations via photon-mediated interactions
• Canceling the cavity length induced phase noise in an optical ring cavity for phase shift measurement and spin squeezing
• Direct production of fermionic superfluids in a cavity-enhanced optical dipole trap