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Research from QphoX, Rigetti, and Qblox Demonstrating Optical Readout Technique for Superconducting Qubits Published in Nature Physics
GlobeNewswire
DELFT, The Netherlands and Berkeley, Calif., Feb. 11, 2025 (GLOBE NEWSWIRE) -- QphoX B.V., a Dutch quantum technology startup that is developing leading frequency conversion systems for quantum applications, Rigetti Computing, Inc. (RGTI.NaE) , a pioneer in full-stack quantum-classical computing, and Qblox, a leading innovator in quantum control stack development, today announced that their joint research demonstrating the ability to readout superconducting qubits with an optical transducer was published in Nature Physics.
Quantum computing has the potential to drive transformative breakthroughs in fields such as advanced material design, artificial intelligence, and drug discovery. Of the quantum computing modalities, superconducting qubits are a leading platform towards realizing a practical quantum computer given their fast gate speeds and ability to leverage existing semiconductor industry manufacturing techniques. However, fault-tolerant quantum computing will likely require 10,000 to a million physical qubits. The sheer amount of wiring, amplifiers and microwave components required to operate such large numbers of qubits far exceeds the capacity of modern-day dilution refrigerators, a core component of a superconducting quantum computing system, in terms of both space and passive heat load.
A potential solution to this problem may be to replace coaxial cables and other cryogenic components with optical fibers, which have a considerably smaller footprint and negligible thermal conductivity. The challenge lies in converting the microwave signals used to control qubits into infrared light that can be transmitted through fiber. This is where microwave-to-optical transduction comes into play, a field dedicated to the coherent conversion of microwave photons to optical photons. QphoX has developed transducers with piezo-optomechanical technology that are capable of performing this conversion, forming an interface between superconducting qubits and fiber-optics.
To demonstrate the potential of this technology, QphoX, Rigetti and Qblox connected a transducer to a superconducting qubit, with the goal of measuring its state using light transmitted through an optical fiber. The results of this collaborative effort have been published in Nature Physics. Remarkably, it was discovered that not only is the transducer capable of converting the signal that reads out the qubit, but that the qubit can also be sufficiently protected from decoherence introduced by thermal noise or stray optical photons from the transducer during operation.
"Microwave-to-optics transduction is a rapidly emerging technology with far-reaching implications for quantum computing. Our work demonstrates that transducers are now ready to interface with superconducting qubit technology. This is an exciting and crucial demonstration, with the potential for this technology being far reaching and potentially transformative for the development of quantum computers,” says Dr. Thierry van Thiel, lead author of the work and Lead Quantum Engineer at QphoX.
“Developing more efficient ways to design our systems is key as we work towards fault tolerance. This innovative, scalable approach to qubit signal processing is the result of our strong partnerships with QphoX and Qblox and showcases the value of having a modular technology stack. By allowing our partners to integrate their technology with ours, we are able to discover creative ways to solve long-standing engineering challenges,” says Dr. Subodh Kulkarni, Rigetti CEO.
“Realizing industrial-scale quantum computers comes with solving several critical bottlenecks. Many of these lie in the scalability of the readout and control of qubits. As Qblox is entirely focused on exactly this theme, we are proud to be part of this pivotal demonstration that shows that QphoX microwave-to-optical transducers are a solid route to scalable quantum computing. We look forward to the next steps with Rigetti and QphoX to scale up this technology,” says Dr. Niels Bultink, Qblox CEO.
About QphoX
QphoX is the leading developer of quantum transduction systems that enable quantum computers to network over optical frequencies. Leveraging decades of progress in photonic, MEMS and superconducting device nanofabrication, their single-photon interfaces bridge the gap between microwave, optical and telecom frequencies to provide essential quantum links between computation, state storage and networking. QphoX is based in Delft, the Netherlands. See www.qphox.eu/ for more information.
About Rigetti
Rigetti is a pioneer in full-stack quantum computing. The Company has operated quantum computers over the cloud since 2017 and serves global enterprise, government, and research clients through its Rigetti Quantum Cloud Services platform. In 2021, Rigetti began selling on-premises quantum computing systems with qubit counts between 24 and 84 qubits, supporting national laboratories and quantum computing centers. Rigetti’s 9-qubit Novera™ QPU was introduced in 2023 supporting a broader R&D community with a high-performance, on-premises QPU designed to plug into a customer’s existing cryogenic and control systems. The Company’s proprietary quantum-classical infrastructure provides high-performance integration with public and private clouds for practical quantum computing. Rigetti has developed the industry’s first multi-chip quantum processor for scalable quantum computing systems. The Company designs and manufactures its chips in-house at Fab-1, the industry’s first dedicated and integrated quantum device manufacturing facility. Learn more at www.rigetti.com/.
About Qblox
Qblox is a leading provider of scalable and modular qubit control stacks. Qblox operates at the frontier of the quantum revolution in supporting academic and industrial labs worldwide. The Qblox control stack, known as the Cluster, combines key technologies for qubit control and readout and supports a wide variety of qubit technologies. Qblox has grown to 130+ employees and continues to innovate to enable the quantum industry. Learn more at www.qblox.com/.
Computing whether I am a threat or not. Taken at the Deer Flat National Wildlife Refuge here in Idaho.
This is the hardware side of the NAS solution I was putting together before I came down with COVID. Will have that working shortly. This little computer compared with my very first PC here.
Shot with Sony 24-105mm f/2.8 macro lens on Sony a7r iii.
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Join new astronavigation programm now! Become a member of our computing team! Use your mind to lay a way to the stars! Note: all messages about brain injures and mental disorders, caused by collective mind computing, are totally fake.
We use this machine at our research center to train deep neural networks and for other compute-intensive tasks.
That is some high tech right there.
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See detailed setup info and learn more about this image at the source.
Source: photos.jdhancock.com/photo/2014-02-09-023953-cloud-comput...
I made this picture for the Inria contest on "Computing: past, present, and future". The abacus is, to me, the birth of computing.
I borrowed a camera with a very fast lens, and went to the server room of our research center, where I played finding a spot for the abacus in the middle of the computing equipment. A large numerical aperture gave me a short depth of field, turning the lights in a nice bokeh.
I did fairly little post-processing, using darktable as always. I used a local contrast filter on the abacus itself, and pushed the colors in the top right of the photo toward green.
Old cash register on display at the cute and quaint Al Vecchio Convento hotel in Forlì-Cesena, Italy.
..in west of Ireland. Old Head Beach, located along the County Mayo coastline. This popular beach is located 16 kilometers(10 miles) west of Westport town.
Taken from Noonamah area at about 0300hrs today. Clouds backlit by lightning which was probably about 50Km east of Acacia Hills.
Petri Computor 35, with CC Petri 2.8/40 lens.
Compact camera, produced from 1970 until 1974. Clearly inspired by the Konica C35, so it has the programmed shutter and rangefinder focussing, but it differs in details. The exposure metering in not controlled by a needle displayed in the viewfinder, but by two lights (green/orange) for acceptable or risky shutter speeds. They are visible on top and in the viewer.
The film speed is set with a ring around the lens and not with a fiddly ring inside the filter thread. As the camera has no dial for exposure compensation, you can manipulate the exposure very quickly here.