Agenda

Plug & Play Quantum Circuits

Wolfgang Pfaff, Principal Investigator, UIUC 

Superconducting quantum circuits are a leading platform for building large-scale quantum systems, such as quantum processors or simulators, from the bottom up. Circuit quantum electrodynamics provides us with excellent control over single artificial atoms, microwave photons, and their interactions. Scaling circuits to larger and larger numbers of qubits, however, is an ongoing challenge: Owing to inevitable imperfections in designing and fabricating devices, building large systems with precisely defined interactions is very difficult.
In this talk, I will present our efforts to build circuits in a 'plug-and-play' fashion from isolated and separated components. By utilizing drive-controlled qubit-photon interactions we aim to realize modular and reconfigurable quantum networks in which qubits exchange quantum information through microwave photons. We are exploring how fast and high-fidelity two-qubit gates can be performed, quantum information may be distributed, and how remote entanglement may be stabilized through a common bath, for instance through engineered nonreciprocal qubit-photon interactions. Our work may provide insight on how quantum devices can be scaled more robustly, and how distributed quantum states can be stabilized in open systems.

Tailoring Quantum Entanglement in Driven-Dissipative Superconducting Circuits

Alex Ma, Principle Investigator  at Purdue University

Quantum entanglement is at the heart of quantum information sciences and applications. It is crucial to understand and control entanglement in the presence of environmental interactions and dissipation. Superconducting (SC) circuits provide an ideal playground where we can precisely tailor the coupling between the quantum circuit and engineered baths, and observe the resulting microscopic dynamics of entanglement and information evolution. In this talk, I will introduce our ongoing analog quantum simulation experiments using SC circuits. We engineer highly tunable driven-dissipative baths, and apply them to generate, control, and probe many-body states of interacting microwave photons. We investigate how strong quantum correlations can be stabilized in SC qubit lattices subject to local or non-local engineered bath couplings; and explore new driven-dissipative protocols to create novel many-body states both at- and out-of- equilibrium.

Integrating an Atom Array with a Nanophotonic Chip via Background-free Imaging 

Noah Glachman, PhD student University of Chicago (Hannes Brenien group)

Neutral atom arrays in optical tweezers are a promising platform for quantum information processing thanks to their scalability, reconfigurability, and high-fidelity control. Individual atoms have long-lived internal states and are inherently indistinguishable, making them ideal candidates for quantum networking applications as well. Merging these application spaces by integrating an atomic array with a photonic interface would enable exciting avenues towards distributed architectures. However, many key atom array techniques are challenging to implement in the presence of photonic interfaces, most notably single-shot imaging due to undesirable scattering of the excitation laser from the nearby photonic interface. We have developed an architecture that combines atom arrays with up to 64 optical tweezers and a millimeter-scale photonic chip hosting more than 100 nanophotonic devices. We demonstrate high-fidelity, background-free imaging in close proximity to the devices using a multichromatic excitation and detection scheme and image the atoms while trapped a few hundred nanometers above the dielectric surface. We show that we can rearrange atoms into defect-free configurations and simultaneously load them onto single or multiple different nanophotonic devices.

Unlocking the Potential of Quantum-Classical Processing

Yonatan Cohen, co-founder & CTO, Quantum Machines

In recent years, it has become increasingly clear that realizing the potential of Quantum Computers would require tight quantum-classical integration, in particular to overcome the high error rate in various manners. In this talk, we will dive into the considerations for building quantum-classical architectures and present the latest progress and developments in the field. We will present our latest results from Google-Quantum Machine’s collaboration to perform long range quantum teleportation, demonstrating the need of and the advantage of tight, real-time quantum-classical integration. We will discuss the importance of defining quantum-classical processing requirements and benchmarks. Finally, we will introduce NVIDIA-Quantum Machine’s DGX Quantum, an architecture built to scale up ultra-low latency quantum-classical machines towards practical implementations of quantum error correction.