MIT researchers have demonstrated what they believe is the strongest nonlinear light-matter coupling ever achieved in a quantum system. Their experiment is a step toward realizing quantum operations and readout that could be performed in a few nanoseconds. The researchers used a novel superconducting circuit architecture to show nonlinear light-matter coupling that is about an order of magnitude stronger than prior demonstrations, which could enable a quantum processor to run about 10 times faster. “This would really eliminate one of the bottlenecks in quantum computing. Usually, you have to measure the results of your computations in between rounds of error correction. This could accelerate how quickly we can reach the fault-tolerant quantum computing stage and be able to get real-world applications and value out of our quantum computers,” says Yufeng “Bright” Ye, lead author of a paper on this research. The new architecture, based on a superconducting “quarton” coupler, achieved coupling strengths roughly ten times higher than previous designs, potentially allowing quantum processors to run ten times faster. Faster readout and operations are critical to reducing errors in quantum computation, which depend on performing error correction within the limited lifespans of qubits. Researchers demonstrated extremely strong nonlinear light-matter coupling in a quantum circuit. Stronger coupling enables faster readout and operations using qubits, which are the fundamental units of information in quantum computing. (Christine Daniloff, MIT)