Largest-ever 3-D quantum chip for boosting analog quantum computing

May 14, 2018, Shanghai Jiao Tong University

Chinese scientists Xianmin Jin and his colleagues from Shanghai Jiao Tong University have successfully fabricated the largest-scaled quantum chip and demonstrated the first two-dimensional quantum walks of single photons in real spatial space, which may provide a powerful platform to boost analog quantum computing for quantum supremacy.

Since early last year, IBM, Google, Intel and rivals have competed to set new records on the achieved number of qubits in quantum development. However, universal quantum computers are far from feasible until error correction and full connections between the increasing number of qubits can be realized. In contrast, analog quantum computers, or quantum simulators, can be built in a straightforward way to solve practical problems directly without , and potentially beat the computational power of classical computers in the near future.

As a powerful and straightforward approach to analog , the quantum walk in a two-dimensional array maps certain computing tasks into the coupling matrix of the quantum paths, and provides efficient solutions to even classically intractable problems. Prominent quantum advantages are achievable as long as the scale of quantum systems goes above a considerably large level. Xianmin Jin et al are now able to fabricate a three-dimensional photonic chip with a scale up to 49×49 nodes using a technique called femtosecond direct writing. It is the largest-scaled chip reported so far that allows for the realization of this two-dimensional quantum walk in real spatial space, and allows researchers to explore many new quantum computing tasks.

This work demonstrates that the dimension and scale of quantum system can be employed as new resources for boosting quantum computing power. During the past two decades, increasing the photon number has posed a challenge, resulting in probabilistic generation of and multiplicative loss. This ingenious alternative method of increasing the external physics dimension and complexity of the quantum evolution system may accelerate future analog computing.

Explore further: IBM says it's reached milestone in quantum computing

More information: Hao Tang et al. Experimental two-dimensional quantum walk on a photonic chip, Science Advances (2018). DOI: 10.1126/sciadv.aat3174

Related Stories

Researchers develop prototype of advanced quantum memory

April 12, 2018

Employees of Kazan Federal University and Kazan Quantum Center of Kazan National Research Technical University demonstrated an original layout of a prototype of multiresonator broadband quantum-memory interface.

The exciting new age of quantum computing

October 25, 2016

What does the future hold for computing? Experts at the Networked Quantum Information Technologies Hub (NQIT), based at Oxford University, believe our next great technological leap lies in the development of quantum computing.

Recommended for you

Scientists produce 3-D chemical maps of single bacteria

November 16, 2018

Scientists at the National Synchrotron Light Source II (NSLS-II)—a U.S. Department of Energy (DOE) Office of Science User Facility at DOE's Brookhaven National Laboratory—have used ultrabright x-rays to image single bacteria ...

Quantum science turns social

November 15, 2018

Researchers in a lab at Aarhus University have developed a versatile remote gaming interface that allowed external experts as well as hundreds of citizen scientists all over the world to optimize a quantum gas experiment ...

Bursting bubbles launch bacteria from water to air

November 15, 2018

Wherever there's water, there's bound to be bubbles floating at the surface. From standing puddles, lakes, and streams, to swimming pools, hot tubs, public fountains, and toilets, bubbles are ubiquitous, indoors and out.

Terahertz laser pulses amplify optical phonons in solids

November 15, 2018

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg/Germany presents evidence of the amplification of optical phonons ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.