Transistors, the tiny switches that form the bedrock of modern computing—billions of them — route electrical signals around inside the circuitry of our devices. Quantum computers will need analogous hardware to manipulate quantum information. But the design constraints for this new technology are stringent, and even today’s most advanced processors can’t be repurposed as quantum devices. That’s because quantum information carriers, dubbed qubits, have to follow the different rules laid out by quantum physics.
Scientists can use many kinds of quantum particles as qubits, including photons. These 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 Joint Quantum Institute (JQI 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, able to process 10 billion photonic qubits per second.
This transistor should be able to perform quantum gates between photons. 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. This allows a single photon to switch a bigger stream of photons, which is essential for the 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 one photon and demonstrated that their quantum transistor could switch a light pulse containing around 30 photons before the quantum dot’s memory ran out.
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.