Quantum-Classical Circuits & Algorithms

Abstracts:

Advanced Control of Superconducting Circuits for QuantumInformation Processing

Max Hays, Postdoctoral Associate & Jeff Grover, Research Scientist, Research Laboratory of Electronics, MIT (Will Oliver group)

Superconducting circuits are a leading platform for quantum information processing. As the field pushes into lower-error regimes and system complexity grows, advanced control techniques must be deployed to maximize operation fidelities. In this talk, we survey several experiments along this research avenue that we are exploring in the Engineering Quantum Systems Group at MIT. We will discuss how reinforcement learning can be leveraged to improve two-qubit gate fidelities, bosonic error correction, and long-range entanglement generation, and how hardware advancements can accelerate the training loop between the classical agent and the experimental system. Furthermore, we will discuss how classical feedback can be used to stabilize system bias, improving gate fidelities and system robustness.

Unlocking the Potential of Quantum-Classical Processing

Dr. 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. 

The Quantum Age: From Atomic Clocks to Quantum Computers 

Vladan Vuletić, Department of Physics, MIT

The last few years have seen a remarkable development in our ability to control many neutral atoms individually, and induce controlled interactions between them on demand. This progress ushers in a new era where one can create highly entangled states of many particles, break certain limits for quantum sensors, or study quantum phase transitions. I will present results on optical transition atomic clocks enhanced by entanglement, and on quantum simulation with atomic arrays containing more than 250 atoms. Finally, I will discuss prospects for near- and medium-term neutral-atom quantum computers with full quantum error correction.

Progress Towards Quantum Error Correction with Atom Arrays In an Optical Cavity

Josiah Sinclair, Department of Physics, MIT (Vladan Vuletić group)

It has been recently shown that surface code error-corrected qubits can be connected with noisy links without requiring distillation, better local gates, or space-time overheads [1]. Combining recent advances in atom arrays with these results I will report progress towards a flexible experimental platform for modular quantum computing comprising a programmable Rydberg atom array interfaced with an optical cavity. In such a platform, fault-tolerant scaling via noisy photonic interconnects can be achieved with two-qubit gate and Bell pair error thresholds of 1% and 10% respectively, as well as sufficiently fast entanglement distribution. I will also describe progress towards the nearer-term goal of using the cavity for scalable syndrome readout for quantum error correction. Finally, I’ll discuss our recent discovery that we can use the cavity to directly observe light-assisted collisions in real time and present our latest results.