Transistors are tiny switches that form the bedrock of modern computing; billions of them route electrical signals around inside a smartphone, for instance.
Quantum computers will need analogous hardware to manipulate quantum information. But the design constraints for this new technology are stringent, and today’s most advanced processors can’t be repurposed as quantum devices. That’s because quantum information carriers, dubbed qubits, have to follow different rules laid out by quantum physics.
Scientists can use many kinds of quantum particles as qubits, even the photons that make up light. Photons have added appeal because they can swiftly shuttle information over long distances, and they are compatible with fabricated chips. However, making a quantum transistor triggered by light has been challenging because it requires that the photons interact with each other, something that doesn’t ordinarily happen on its own.
Now, researchers at the University of Maryland’s A. James Clark School of Engineering and Joint Quantum Institute (JQI)–led by Professor of Electrical and Computer Engineering, JQI Fellow, and Institute for Research in Electronics and Applied Physics Affiliate Edo Waks–have cleared this hurdle and demonstrated the first single-photon transistor using a semiconductor chip. The device, described in the July 6 issue of Science, is compact; roughly one million of these new transistors could fit inside a single grain of salt. It is also fast and able to process 10 billion photonic qubits every second.
“Using our transistor, we should be able to perform quantum gates between photons,” says Waks. “Software running on a quantum computer would use a series of such operations to attain exponential speedup for certain computational problems.
The photonic chip is made from a semiconductor with numerous holes in it, making it appear much like a honeycomb. Light entering the chip bounces around and gets trapped by the hole pattern; a small crystal called a quantum dot sits inside the area where the light intensity is strongest. Analogous to conventional computer memory, the dot stores information about photons as they enter the device. The dot can effectively tap into that memory to mediate photon interactions–meaning that the actions of one photon affect others that later arrive at the chip.
“In a single-photon transistor the quantum dot memory must persist long enough to interact with each photonic qubit,” says Shuo Sun, lead author of the new work and postdoctoral research fellow at Stanford University who was a UMD grad student at the time of the research. “This allows a single photon to switch a bigger stream of photons, which is essential for our device to be considered a transistor.”
To test that the chip operated like a transistor, the researchers examined how the device responded to weak light pulses that usually contained only one photon. In a normal environment, such dim light might barely register. However, in this device, a single photon gets trapped for a long time, registering its presence in the nearby dot.
The team observed that a single photon could, by interacting with the dot, control the transmission of a second light pulse through the device. The first light pulse acts like a key, opening the door for the second photon to enter the chip. If the first pulse didn’t contain any photons, the dot blocked subsequent photons from getting through. This behavior is similar to a conventional transistor where a small voltage controls the passage of current through its terminals. Here, the researchers successfully replaced the voltage with a single photon and demonstrated that their quantum transistor could switch a light pulse containing around 30 photons before the quantum dot’s memory ran out.
Waks says that his team had to test different aspects of the device’s performance prior to getting the transistor to work. “Until now, we had the individual components necessary to make a single photon transistor, but here we combined all of the steps into a single chip,” he says.
Sun says that with realistic engineering improvements their approach could allow many quantum light transistors to be linked together. The team hopes that such speedy, highly connected devices will eventually lead to compact quantum computers that process large numbers of photonic qubits.
Receive an email update when we add a new QUANTUM COMPUTER article.
The Latest on: Quantum computer
via Google News
The Latest on: Quantum computer
- Direct visualization of quantum dots reveals shape of quantum wave functionon November 23, 2020 at 1:58 pm
Trapping and controlling electrons in bilayer graphene quantum dots yields a promising platform for quantum information technologies. Researchers have now achieved the first direct visualization of ...
- Researchers minimize quantum backaction in thermodynamic systems via entangled measurementon November 23, 2020 at 10:14 am
Led by academician Prof. Guo Guangcan from the Chinese Academy of Sciences (CAS), Prof. Li Chuanfeng's group and Prof. Xiang Guoyong's group from University of Science and Technology of China (USTC), ...
- Quantum X-ray microscope in developmenton November 23, 2020 at 8:17 am
Brookhaven National Laboratory have begun building a quantum-enhanced X-ray microscope at the National Synchrotron Light Source II (NSLS-II). This groundbreaking microscope, supported by the ...
- To do in 2021: Get up to speed with quantum computing 101on November 23, 2020 at 5:47 am
The first step is to understand qubits and superposition. The next one is to get a handle on the business advantage that this technology represents.
- Can a Computer Devise a Theory of Everything?on November 23, 2020 at 2:06 am
It might be possible, physicists say, but not anytime soon. And there’s no guarantee that we humans will understand the result.
- Scientist Who Developed Quantum Computing Code Wins ORNL’s Top Science Awardon November 20, 2020 at 9:39 am
Paul Kent, a computational nanoscience researcher in Oak Ridge National Laboratory's Computing and Computational Science Directorate, ...
- Don’t delay, fix your data now for when quantum computing is fully readyon November 20, 2020 at 8:04 am
Tiernan Ray explains that software startup Zapata Computing of Boston, which makes developer tools to program quantum computers, says companies need to get a handle on things like data cleaning and ...
- Zapata Computing Raises $38M Series B to Accelerate Commercial Quantum Adoptionon November 20, 2020 at 7:27 am
Zapata Computing, Inc., a leading enterprise software company for NISQ-based quantum applications, today announced it has ...
- Quantum computing roadmap for solving scientific challengeson November 20, 2020 at 5:00 am
Already, industries, universities, and governments around the world are making important contributions to scientific research toward practical quantum computing applications, acco ...
via Bing News