en.Wedoany.com Reported - The Defense Advanced Research Projects Agency (DARPA) recently announced the official launch of the "Heterogeneous Accelerated Reconfigurable Quantum" (HARQ) program, aimed at addressing the current reliance of quantum computing on a single qubit modality. This program is dedicated to integrating various qubit technologies into a unified system framework, laying the groundwork for next-generation scalable quantum computing. According to DARPA's official press release, HARQ Program Manager Justin Cohen stated: "Each qubit technology has its unique advantages, but no single approach can meet all the requirements for large-scale, high-performance quantum systems. HARQ calls on the quantum industry to move beyond the mindset of 'one qubit to rule them all.'"

The HARQ program establishes two parallel technical workflows. The first workflow, named "Multi-Qubit Optimized Software Architecture through Interconnected Compilation" (MOSAIC), focuses on compiler design and the development of software abstraction layers capable of mapping quantum algorithms onto heterogeneous qubit resources. According to DARPA's program solicitation documents, the MOSAIC workflow aims to develop hardware- and network-aware quantum compilers that allocate quantum operations to the most suitable qubit types, potentially reducing resource requirements to one-thousandth. The second workflow, named "Quantum Shared Backbone" (QSB), focuses on developing high-fidelity quantum interconnect hardware technologies capable of linking different qubit platforms.

The MOSAIC workflow participating teams include Infleqtion, memQ, Q-CTRL, the University of Michigan, and the University of Pennsylvania. According to a memQ company announcement, its team also includes qBraid and researchers from MIT, Yale University, and the University of Chicago. They will develop hardware- and network-aware quantum compilers by optimizing the mapping and partitioning of logical circuits across different quantum processors, leveraging the specific strengths of each qubit modality. According to Carnegie Mellon University's official press release, the QSB workflow includes the University of Texas at Austin, the Australian National University, Carnegie Mellon University, École Polytechnique Fédérale de Lausanne, Harvard University, IonQ, Stanford University, the University of California, Berkeley, the University of Illinois Urbana-Champaign, and the University of Maryland. The Carnegie Mellon University team, led by Associate Professor Qing Li from the Department of Electrical and Computer Engineering, will develop an optical-to-optical frequency conversion scheme based on an integrated silicon carbide photonic platform, enabling high-fidelity quantum state conversion within the 370 to 1550 nanometer wavelength range.

Participating teams have distinct strengths in their specific technical approaches. IonQ's contribution focuses on developing specialized quantum memories manufactured using quantum-grade synthetic diamonds, aiming to meet DARPA's requirements for high rates and high fidelity in long-distance entanglement distribution. According to IonQ's official announcement, the company has collaborated with the Air Force Research Laboratory to demonstrate the first remote photon interconnection between two commercial quantum computers via quantum entanglement, validating the capabilities for photon generation, transmission, and detection needed to connect separate processors. Associate Professor Kejie Fang from the Department of Electrical and Computer Engineering at the University of Illinois Urbana-Champaign received a two-year, $2 million grant to develop a wavelength-adaptive entangled photon source based on nonlinear photonic integrated circuits, combining indium gallium phosphide nanophotonic waveguides with periodically poled lithium niobate thin-film waveguide technology.

The HARQ program involves 19 performing teams across 15 institutions, spanning academia and industry. According to publicly available program information, the program is scheduled for a 24-month period, with the goal of demonstrating the feasibility of heterogeneous quantum architecture within two years. Through the HARQ program, DARPA is promoting a paradigm shift in quantum computing from a "homogeneous" to a "heterogeneous" path, drawing inspiration from the established concept of division of labor and collaboration among CPUs, GPUs, and ASICs in classical computing. If successful, HARQ will establish foundational standards for quantum system architecture, representing a crucial step in advancing quantum computing from the laboratory to practical application, with the potential to accelerate scientific discovery in fields such as materials science, chemistry, and medicine in the future.

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