D-Wave demonstrates large-scale coherence in quantum annealer for the first time
D.Wave Quantum Inc. (NYSE: QBTS) is currently the only quantum computer provider to build both annealing and gate models. on September 16, D-Wave published a landmark study in the journal Nature Physics - "Programmable 2000 Coherent Quantum Annealing Problem in the Bit Ising Chain" [1], which is the first large-scale demonstration of coherent quantum annealing.
01First Demonstration of Quantum Phase Change Dynamics in a Quantum Annealing Processor with 8-2000 Quantum Bits
This study demonstrates for the first time the dynamics of quantum phase transitions in a large-scale programmable quantum annealing processor using up to 2000 quantum bits in a D-Wave processor. The demonstration goes beyond the scale of any previous programmable quantum phase transitions, opening the door to simulating exotic phases of matter (unusual states of matter other than the liquids, solids or gases that make up the universe): phase transitions that would otherwise be difficult to handle.
The results of this research, a collaboration between scientists from D-Wave, the University of Southern California, Tokyo Institute of Technology and Saitama Medical University, show that the fully programmable D-Wave quantum processor can be used as an accurate simulator of large scale coherent quantum dynamics. This shows that the "kink" (kink) pattern of the separated correlated spins is almost identical to the exact analytical solution of the Schrödinger equation for an ideal quantum system, completely isolated from external noise. The density and spacing of the kinks depend on factors such as the speed and "quantumness" of the experiment. Measurements of single-quantum-bit parameters are shown to allow the experiment to accurately predict the behavior of systems with 8-2000 quantum bits, demonstrating a high level of control for quantum simulations of all scales.
Quantum phase transition in an annealed Ising chain. a) Quantum annealing of a transverse field Ising chain. b) Response time diverges at the quantum critical point as a function of the critical exponents z and ν. c) Example of a quantum annealed output state for a chain of L = 2000 quantum bits.
Nodal density ratios and distributions. a) Quantum annealing data are shown for weak coupling (J = 0.12) and strong coupling (J = -1.4). b) (Boltzmann, Boltzmann) model results. c) The first three product points of the nodal distribution, with lines indicating coherence theory. All error bars represent 95% statistical confidence intervals.
02Achieving Predictable Simulations to Demonstrate Large-Scale Coherence
Dr. Andrew King, Director of D-Wave Performance Research, said [2], "Essentially, these experiments measure the D-Wave processor against a very well understood quantum standard. We found good agreement between theory and experiment, which gives us confidence in our ability to manipulate programmable quantum systems, whether for optimization applications or quantum simulations."
By using D-Wave's quantum annealer to simulate quantum dynamics on a much shorter time scale than previously thought possible, this experiment shows that the devices can operate without any perceptible external environmental influence. Daniel Lidar, professor of engineering at USC and director of the USC Center for Quantum Science and Technology, said, "This opens the door to quantum simulations of models that are too large and complex to be simulated by any other means at this time."
Hidetoshi Nishimori, a professor at the Institute of Innovation at Tokyo Institute of Technology, said, "This paper paves the way for practical quantum simulations on a scale that is unmatched by other means, including classical computing."
"Coherence is the holy grail of quantum computing." Alan Baratz, CEO of D-Wave, said, "By simulating closed quantum systems without thermal effects on a large scale, we can gather valuable insights into the computational power of our processors, thereby increasing our ability to find high-quality solutions for our customers. Continued advances in coherence time are a key priority for our annealing and gating modeling programs. The demonstration of large-scale coherence is another step in demonstrating real-world quantum advantages, and this research is an important step toward that milestone."
03Foundations of large-scale quantum simulations solidify D-Wave's quantum status
The significance of this achievement goes beyond the fundamental scientific aspects of understanding quantum phase transitions in one-dimensional matter: by establishing the technical basis for large-scale quantum simulations, it paves the way for a scientific understanding of the properties of a wider range of quantum materials.
Not only that, but this scientific achievement also solidifies D-Wave's commitment to quantum technology innovation and product delivery. To date, D-Wave has brought five generations of quantum computers to market and in June 2022 launched Advantage2, an experimental prototype of its sixth-generation machine. as part of the company's roadmap, the Advantage2 system was released in the fall of 2021 and is scheduled to be available in 2023 -2024. The full Advantage2 system is expected to feature more than 7,000 quantum bits, with a new quantum bit design that enables 20-way connectivity between quantum bits in a new topology.
The company also has an extensive portfolio of more than 200 patents applicable to annealing and gate-based quantum computing.Earlier in 2022, D-Wave also opened the first U.S.-based Advantage™ Quantum Cloud service, located at the USC-Lockheed Martin Quantum Computing Center (QCC) at the University of Southern California's Institute for Information Science (ISI): the center is the part of the University's prestigious Viterbi School of Engineering.
Reference links:
[1]https://www.nature.com/articles/s41567-022-01741-6
[2]https://www.dwavesys.com/company/newsroom/press-release/d-wave-demonstrates-large-scale-coherent-quantum-annealing/
