The quantum Fredkin gate has been experimentally realised for the first time
Researchers from Griffith University and the University of Queensland have overcome one of the key challenges to quantum computing by simplifying a complex quantum logic operation. They demonstrated this by experimentally realising a challenging circuit — the quantum Fredkin gate — for the first time.
“The allure of quantum computers is the unparalleled processing power that they provide compared to current technology,” said Dr Raj Patel from Griffith’s Centre for Quantum Dynamics.
“Much like our everyday computer, the brains of a quantum computer consist of chains of logic gates, although quantum logic gates harness quantum phenomena.”
The main stumbling block to actually creating a quantum computer has been in minimising the number of resources needed to efficiently implement processing circuits.
“Similar to building a huge wall out lots of small bricks, large quantum circuits require very many logic gates to function. However, if larger bricks are used the same wall could be built with far fewer bricks,” said Dr Patel.
“We demonstrate in our experiment how one can build larger quantum circuits in a more direct way without using small logic gates.”
At present, even small and medium scale quantum computer circuits cannot be produced because of the requirement to integrate so many of these gates into the circuits. One example is the Fredkin (controlled- SWAP) gate. This is a gate where two qubits are swapped depending on the value of the third.
Usually the Fredkin gate requires implementing a circuit of five logic operations. The research team used the quantum entanglement of photons — particles of light — to implement the controlled-SWAP operation directly.
“There are quantum computing algorithms, such as Shor’s algorithm for factorising prime numbers, that require the controlled-SWAP operation.
The quantum Fredkin gate can also be used to perform a direct comparison of two sets of qubits (quantum bits) to determine whether they are the same or not. This is not only useful in computing but is an essential feature of some secure quantum communication protocols where the goal is to verify that two strings, or digital signatures, are the same,” said Professor Tim Ralph from the University of Queensland.
Professor Geoff Pryde, from Griffith’s Centre for Quantum Dynamics, is the project’s chief investigator.
“What is exciting about our scheme is that it is not limited to just controlling whether qubits are swapped, but can be applied to a variety of different operations opening up ways to control larger circuits efficiently,” said Professor Pryde.
“This could unleash applications that have so far been out of reach.”
Learn more: Unlocking the gates to quantum computing
The Latest on: Quantum computing
via Google News
The Latest on: Quantum computing
- New model helps to describe defects and errors in quantum computerson June 24, 2020 at 10:36 am
A summer internship in Bilbao, Spain, has led to a paper in the journal Physical Review Letters for Jack Mayo, a Master's student at the University of Groningen, the Netherlands. He has helped to ...
- Honeywell claims it has built the most powerful quantum computer everon June 24, 2020 at 9:35 am
Honeywell, a US-based tech firm, has built the most powerful quantum computer ever by some measures, but some experts say it isn’t actually better than other quantum computers on the market ...
- QCI Launches Free Trial of its Mukai Quantum Computing Application Platformon June 24, 2020 at 7:50 am
Quantum Computing Inc. is launching a free trial of its Mukai quantum computing software execution platform. The trial ...
- Honeywell claims to have built the highest-performing quantum computer availableon June 22, 2020 at 7:11 am
Multinational conglomerate Honeywell International Inc. is claiming to have built the highest-performing quantum computer available today. It made the announcement in a blogpost on its website. The ...
- Honeywell Unveils The World's Fastest Quantum Computeron June 22, 2020 at 3:20 am
The race toward quantum-computing devices capable of beating digital systems in real-world applications continues.
- To live up to the hype, quantum computers must repair their error problemson June 22, 2020 at 3:04 am
Now, multiply that error rate by the billions or trillions of calculations per second possible in a typical modern computer. For complex computations, a small probability for error can quickly ...
- A love for sci-fi sparked Megan Brown’s STEM path and led to quantum computing at Microsofton June 20, 2020 at 5:00 pm
Megan Brown grew up in a house where an interest in science and science fiction were highly encouraged. She credits weekly viewings of the television series “Stargate SG-1” as one of the reasons ...
- Meet Silq: The first intuitive programming language for quantum computerson June 20, 2020 at 6:17 am
Silq is, its creators claim, the world’s first high-level quantum computer programming language. Here's why it's so exciting for those working in the field.
- Honeywell Says It Has Built The World’s Most Powerful Quantum Computeron June 19, 2020 at 9:26 am
In the race to the future of quantum computing, Honeywell has just secured a fresh lead. The North Carolina-based conglomerate announced Thursday that it has produced the world’s fastest quantum ...
- This Is the First Universal Language for Quantum Computerson June 19, 2020 at 5:25 am
A quantum computing startup called Quantum Machines has released a new programming language called QUA. The language runs on the startup’s proprietary Quantum Orchestration Platform. Quantum Machines ...
via Bing News