Abstract
We study a two-level impurity coupled locally to a quantum gas on an optical lattice. For state-dependent interactions between the impurity and the gas, we show that its evolution encodes information on the local excitation spectrum of the gas at the coupling site. Based on this, we design a nondestructive method to probe the system’s excitations in a broad range of energies by measuring the state of the probe using standard atom optics methods. We illustrate our findings with numerical simulations for quantum lattice systems, including realistic dephasing noise on the quantum probe, and discuss practical limits on the probe dephasing rate to fully resolve both regular and chaotic spectra.
Highlights
Atomic gases trapped in optical lattices offer unique opportunities for quantum simulation of stronglycorrelated phases of matter [1, 2] as recently demonstrated with the observation of antiferromagnetic correlations in the ground state of Hubbard-model quantum simulators [3,4,5,6,7,8]
As a classical example of a light-based technique, Bragg spectroscopy was developed in early cold atoms experiments to observe the low-energy excitation spectrum of atomic gases [12,13,14,15], a method more recently employed to map the band structure of bosonic superfluids in optical lattices [16]
The excitation spectrum of atomic gases has been probed by stimulated Raman spectroscopy [17,18,19], which is akin to angle-resolved photoemission spectroscopy in condensed matter physics [20]
Summary
Original content from this Abstract work may be used under We study a two-level impurity coupled locally to a quantum gas on an optical lattice. Information on the local excitation spectrum of the gas at the coupling site. We illustrate our findings with numerical the work, journal citation simulations for quantum lattice systems, including realistic dephasing noise on the quantum probe, and DOI.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
