Please join us for this week’s AMO/QI seminar. Our speaker will be Petar Bojovic from the Max Planck Institute of Optics. His talk is titled: Analog and Digital Quantum Simulation with Ultracold Atoms in Optical Lattices
Abstract:
Quantum simulators based on ultracold atoms in optical lattices realize many-body systems with direct connections to long-standing questions of condensed matter theory. In our quantum gas microscope, we load fermionic 6Li atoms into optical superlattices, and image the local density and spin by performing site-resolved projective measurements. I will present how the exceptional control of optical superlattices and local measurements enables us to perform analog quantum simulation and realize building blocks for digital quantum computation.
We conduct systematic experimental quantum simulations of the Fermi-Hubbard model, a key model frequently used to study the physics of high-temperature superconductivity. We measure multi-point correlators of spins and charges to perform thermometry of the system, study magnetic polarons and their interactions, and directly detect traces of moving dopants, which are signatures of the strongly correlated states realized in our experiments. Additionally, we investigate the pseudogap phase of the Fermi-Hubbard model, where we observe characteristic behavior of spin susceptibility at temperatures well below the tunneling energy.
Our machine allows us to encode single-particle or two-particle qubits in isolated double wells. Using interacting fermions with opposite spins in double wells, we realize SWAP gates with fidelities higher than 99%. We demonstrate that we can perform X- and Z- rotations with equally high fidelities. This platform of fermionic qubits holds significant potential for quantum computation of electronic systems, such as the simulation of molecules.
References
Immanuel Bloch, Nature Phys. 1, 23-30.
Joannis Koepsell, Sarah Hirthe, Dominik Bourgund, Pimonpan Sompet, Jayadev Vijayan, Guillaume Salomon, Christian Gross, Immanuel Bloch, Phys. Rev. Lett. 125, 010403.
Thomas Chalopin, Petar Bojovic, Dominik Bourgund, Si Wang, Titus Franz, Immanuel Bloch, Timon Hilker, arXiv: 2405.19322