A team of researchers from Yale University has successfully demonstrated one of the key steps in building the architecture for modular quantum computers: the “teleportation” of a quantum gate between two qubits, on demand
Researchers team says it looking to solve one of the big problems in quantum computing: the errors that are introduced by quantum computing processors. “A quantum computer has the potential to efficiently solve problems that are intractable for classical computers,” the team wrote. “However, constructing a large-scale quantum processor is challenging because of the errors and noise that are inherent in real-world quantum systems.”
One way to cut out these errors is to use modularity.
Modularity, which is found in everything from the organization of a biological cell to the network of engines in the latest SpaceX rocket, has proved to be a powerful strategy for building large, complex systems, the researchers say. A quantum modular architecture consists of a collection of modules that function as small quantum processors connected into a larger network.
Modules in this architecture have a natural isolation from each other, which reduces unwanted interactions through the larger system. Yet this isolation also makes performing operations between modules a distinct challenge, according to the researchers. Teleported gates are a way to implement inter-module operation
So essential to this approach is the teleportation of a quantum gate—this would allow interactions without the risk of errors being introduced in the transfer. This idea was first proposed as a theoretical approach in the 1990s. The Yale scientists have now demonstrated it in a real-world experiment.
“Our work is the first time that this protocol has been demonstrated where the classical communication occurs in real-time, allowing us to implement a ‘deterministic’ operation that performs the desired operation every time,” study co-author Kevin Chou said in a statement.
This has big implications for the development of “fault-tolerant quantum computation,” the scientists say. “And when realized within a network it can have broad applications in quantum communication, metrology, and simulations,” they add.
Head investigator Robert Schoelkopf said that: “It is a milestone toward quantum information processing using error-correctable qubits.”
The research Published in Nature.com