Quantum spin dynamics and entanglement generation with hundreds of trapped ions.
Quantum simulation of spin models can provide insight into problems that are difficult or impossible to study with classical computers. Trapped ions are an established platform for quantum simulation, but only systems with fewer than 20 ions have demonstrated quantum correlations. We studied quantum spin dynamics arising from an engineered, homogeneous Ising interaction in a two-dimensional array of (9)Be(+) ions in a Penning trap. We verified entanglement in spin-squeezed states of up to 219 ions, directly observing 4.0 ± 0.9 decibels of spectroscopic enhancement, and observed states with non-Gaussian statistics consistent with oversqueezed states. The good agreement with ab initio theory that includes interactions and decoherence lays the groundwork for simulations of the transverse-field Ising model with variable-range interactions, which are generally intractable with classical methods.
National Institute of Standards and Technology (NIST), Boulder, CO 80305, USA. justin.bohnet@nist.gov jjb@nist.gov.
Justin G
JG
Bohnet
National Institute of Standards and Technology (NIST), Boulder, CO 80305, USA. Georgia Tech Research Institute, Atlanta, GA 30332, USA.
Brian C
BC
Sawyer
National Institute of Standards and Technology (NIST), Boulder, CO 80305, USA. Army Research Lab, Adelphi, MD 20783, USA.
Joseph W
JW
Britton
JILA, NIST, and University of Colorado, Boulder, CO 80309, USA.
Michael L
ML
Wall
JILA, NIST, and Department of Physics, University of Colorado, Boulder, CO 80309, USA.
Ana Maria
AM
Rey
Army Research Lab, Adelphi, MD 20783, USA. Joint Quantum Institute and NIST, Gaithersburg, MD 20899, USA.
Michael
M
Foss-Feig
National Institute of Standards and Technology (NIST), Boulder, CO 80305, USA. justin.bohnet@nist.gov jjb@nist.gov.
John J
JJ
Bollinger