SAMOP 2021 – scientific programme

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QI: Fachverband Quanteninformation

QI 14: Quantum Computing in Industry

QI 14.3: Invited Talk

Friday, September 24, 2021, 15:00–15:30, H3

All quantum computing is hybrid: boosting the power of quantum computers with classical resources — •Sarah Sheldon — IBM Quantum, Almaden Research Center, San Jose, CA 95120, USA

Near term quantum computers will be hampered by noise, and strategies for mitigating noise and algorithms that can lead to quantum advantage without fault tolerance are important areas of current research. This has led to the concept of ``hybrid quantum computing'', typically referring to algorithms like variational quantum eigensolvers require classical optimizations wrapped around quantum calculations, necessitating an interplay between quantum and classical systems. Error mitigation techniques incorporate further resources in the form of additional quantum measurements and classical post-processing to extend the size of circuits that can run successfully. While these methods increase the power of today's quantum computers, they exist a continuum from near term quantum systems to fault tolerant ones. Quantum error correction and algorithms for fault tolerant quantum computers also require classical elements such as feed forward and decoders that operate on classical processors. Recent work has also shown that error mitigation and error correction can be used together to implement universal gates on encoded qubits, establishing that error mitigation will continue to be relevant for increasing the capabilities even of error corrected systems. This talk will focus on using classical resources to augment the capabilities of today's quantum hardware, whether through classical post processing techniques or classical computations within a quantum experiment. I will discuss demonstrations performed on IBM Quantum systems of error mitigation, entanglement forging for doubling the size of systems that can be simulated, and other strategies for extending the range of accessible applications.