Researchers from Google and the University of California Santa Barbara have taken an important step towards the goal of building a large-scale quantum computer.
Writing in the journal Quantum Science and Technology, they present a new process for creating superconducting interconnects, which are compatible with existing superconducting qubit technology.
The race to develop the first large-scale error-corrected quantum computer is extremely competitive, and the process itself is complex. Whereas classical computers encode data into binary digits (bits) that exist in one of two states, a quantum computer stores information in quantum bits (qubits) that may be entangled with each other and placed in a superposition of both states simultaneously.
The catch is that quantum states are extremely fragile, and any undesired interaction with the surrounding environment may destroy this quantum information. One of the biggest challenges in the creation of a large-scale quantum computer is how to physically scale up the number of qubits, while still connecting control signals to them and preserving these quantum states.
Lead author Brooks Foxen, from UC Santa Barbara, said: “There are a lot of unknowns when it comes to imagining exactly what the first large scale quantum computer will look like. In the superconducting qubit field, we’re just now beginning to explore systems with 10s of qubits whereas the long-term goal is to build a computer with millions of qubits.
“Previous research has mostly involved layouts where control wires are routed on a single metal layer. More interesting circuits require the ability to route wiring in three dimensions so that wires may cross over each other. Solving this problem without introducing materials that reduce the quality of superconducting qubits is a hot topic, and several groups have recently demonstrated possible solutions. We believe that our solution, which is the first to provide fully superconducting interconnects with high critical currents, offers the most flexibility in designing other aspects of quantum circuits.”
As superconducting qubit technology grows beyond one-dimensional chains of nearest neighbour coupled qubits, larger-scale two-dimensional arrays are a natural next step.
Prototypical two-dimensional arrays have been built, but the challenge of routing control wiring and readout circuitry has, so far, prevented the development of high fidelity qubit arrays of size 3×3 or larger.
Senior author Professor John M Martinis, jointly appointed at both Google and UC Santa Barbara, said: “To enable the development of larger qubit arrays, we have developed a process for fabricating fully superconducting interconnects that are materially compatible with our existing, high fidelity, aluminum on silicon qubits.
“This fabrication process opens the door to the possibility of the close integration of two superconducting circuits with each other or, as would be desirable in the case of superconducting qubits, the close integration of one high-coherence qubit device with a dense, multi-layer, signal-routing device.”
The Latest on: Large-scale quantum computer
- Rome Lab awards SUNY Poly researchers $900K to study quantum technologies for next-generation computer systems on June 17, 2019 at 2:36 pm
Their research will focus on brain-inspired (neuromorphic) computing systems comprised of quantum devices operating at cryogenic ... This research can accelerate the development of “large scale, ... […]
- A CMOS dynamic random access architecture for radio-frequency readout of quantum devices on June 17, 2019 at 8:16 am
K. & Veldhorst, M. Rent’s rule and extensibility in quantum computing. Preprint at http://arxiv.org/abs/1806.02145 (2018). 6. Fowler, A. G., Mariantoni, M., Martinis, J. M. & Cleland, A. N. Surface ... […]
- Quantum Computing with D-WAVE? on June 14, 2019 at 11:59 am
... article I explain some broad concerns about quantum annealing as a platform for large-scale quantum computing. “Large-scale” is largely a misnomer in the industry today as is large-scale ... […]
- The Brain Is Full of Maps on June 12, 2019 at 10:40 pm
That’s the challenge in quantum computing. The physics makes it very unlikely there’s large-scale quantum coherence. LLOYD: Well, that’s not entirely true. If you look at light from a distant star and ... […]
- The Problem with Quantum Computers on June 11, 2019 at 3:50 pm
These advances may bring us all several steps closer to having robust, reliable large-scale quantum computers to solve complex real-world problems that bring even the fastest classical computers ... […]
- Getting Quantum Ready and What This Means for Cryptography on June 10, 2019 at 11:25 am
These systems will also change the way we approach cybersecurity. In 1994, Peter Shor showed that a large-scale quantum computer would be able to break today’s most-used public key crypto ... […]
- Emerging Technologies Transforming Federal Business, Development on June 5, 2019 at 11:24 am
Representatives from different Federal agencies at ACT-IAC’s Emerging Technology Forum today said that they are leveraging artificial intelligence (AI), robotic process automation (RPA), quantum ... […]
- Quantum Computing in Aerospace & Defense Market 2024: D-Wave Systems Inc,Qxbranch LLC, IBM Corporation on June 5, 2019 at 7:19 am
The market in Asia-Pacific is expected to witness significant growth owing to large-scale investments in quantum computing in China and Japan. The Government of China is expected to invest ... […]
- Physicists 'teleport' logic operation between separated ions on May 30, 2019 at 1:15 pm
... logic operation between two separated ions (electrically charged atoms), showcasing how quantum computer programs could carry out tasks in future large-scale quantum networks. Physicists at the ... […]
- The Pentagon is Trying to Secure Its Networks Against Quantum Codebreakers on May 24, 2019 at 11:45 am
“However, [the Defense Department] must begin now to prepare its information security systems to be able to resist attacks from large-scale quantum computers.” Like most organizations, the Pentagon ... […]
via Google News and Bing News