Quantum computing promises scientific leaps - simulating molecules of atoms for drug discovery, for instance - in the near future.
Handling exponentially more information than today's computers, quantum computers harness the physics that govern subatomic particles to make parallel calculations. Teams worldwide in academia, industry and national labs are researching quantum computers and algorithms. Many run quantum circuit simulations to accelerate their research timelines.
NVIDIA announced at GTC 2021 the cuQuantum software development kit to speed quantum circuit simulations running on GPUs. Early work indicates that cuQuantum delivers orders of magnitude speedups for circuit simulations, paving the way for Nobel Prize-winning breakthroughs of tomorrow.
The expected arrival of quantum supremacy - when a quantum computer solves a problem a classical computer can't in a reasonable time - however, remains an open debate. Still to be solved is decoherence, or falling out of quantum states, as a limiting factor that corrupts the functionality of quantum circuits.
Also, quantum computing relies on quantum bits, or qubits, that can be 0, 1 or both - and many more qubits are required to error correct for decoherence.
The cuQuantum SDK accelerates quantum circuit simulators to help researchers design better quantum computers and verify results, model hybrid-classical systems, and discover more optimal quantum algorithms.
It also provides tools for developers to apply to the methods of their choice, supporting different approaches such as the state vector method or the tensor network method.
State Vector Method Researchers at the J lich Supercomputing Centre have harnessed the state vector method to simulate physical realizations of quantum computers on GPUs. Their benchmark tests, discussed at GTC, showed a 25x speedup on GPU clusters compared with CPU-based systems.
A private company, QCWare, has been publishing papers across the simulation and application of quantum computing domains. Working together, NVIDIA and QCWare have shown compelling evidence that for the quantum approximate optimization algorithm, at 20 qubits, the performance difference is significant.
QCWare and NVIDIA have shown orders of magnitude more performance running quantum simulations on NVIDIA GPUs compared to CPUs alone. Caption: QCWare and NVIDIA have shown orders of magnitude more performance running quantum simulations on NVIDIA GPUs compared to CPUs alone
A single NVIDIA DGX A100 with eight NVIDIA A100 80GB Tensor Core GPUs is capable of simulating up to 36 qubits, delivering orders of magnitude speedup over a dual-socket CPU server on leading state vector simulations.
Besides J lich and QCWare, organizations that use state vector simulators running on NVIDIA GPUs include IBM, Oxford Nanopore, Amazon Web Services and the NVIDIA AI Technology Center.
Tensor Network Method Tensor network simulations are a newer method that uses less memory but more computation than state vector approaches.
Tapping into tensor network methods, NVIDIA and Caltech accelerated a leading quantum circuit simulator with cuQuantum running on NVIDIA A100 Tensor Core GPUs. This setup generated a sample in 9.3 minutes on the NVIDIA Selene supercomputer from a full-circuit simulation of the Google Sycamore circuit. This feat was only recently expected to take days on millions of CPU cores.
In addition to Caltech, those using tensor network simulators include Alibaba, Amazon Web Services, Argonne National Lab and Oak Ridge National Lab.
Density Matrix Sims Researchers from the Pacific Northwest National Laboratory, Lehigh University and Washington State University have developed a new multi-GPU programming methodology, called MG-BSP. They used it to build a density matrix quantum simulator.
The research team demonstrated the simulation of 1 million general gates in 94 minutes on an NVIDIA DGX-2, far deeper circuits than have previously been shown, according to the group.
The results revealed that their density matrix simulator is more than 10x faster than state vector quantum simulators on GPUs and other platforms, according to their paper.
Join our early interest list to stay informed about the latest updates on cuQuantum.
Interior of IBM Quantum computing system pictured. Image credit: IBM
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Quantum computing promises scientific leaps - simulating molecules of atoms for drug discovery, for instance - in the near future.
