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This New Device Enables Quantum Computers to Calculate Much More Complex Questions that Today’s Computers Can’t Handle

The future of computers lies in quantum computing. No longer will we be working with 1’s and 0’s, but qubits that are capable of being both 1 and 0 at the same time. In terms of capability, this means that a quantum computer is able to calculate much more complex problems simultaneously, unlike your standard computer.


But, as great as that all sounds, it’s not easy programming a quantum computer to be able to solve these difficult equations. However, one recent study may have just made the process a little easier. The involved study scientists at Princeton University and basically consisted of the group creating a device that was able to pass a quantum state from particle to particle. One of the researchers involved in the study and graduate student in Princeton’s Department of Physics, Xiao Mi, said, “We now have the ability actually to transmit the quantum state to a photon. This has never been done before in a semiconductor device because the quantum state was lost before it could transfer its information.”

The qubit consists of a single electron that is trapped below the surface of a silicon chip (gray). The green, pink and purple wires on top of the silicon structure deliver precise voltages to the qubit. The purple plate reduces electronic interference that can destroy the qubit’s quantum information. By adjusting the voltages in the wires, the researchers can trap a single electron in a double quantum dot and adjust its energy so that it can communicate its quantum information to a nearby photon. (Photo courtesy of the Jason Petta research group, Department of Physics)


A fully packaged device for trapping and manipulating single electrons and photons. A series of on-chip electrodes (lower left and upper right) lead to the formation of a double quantum dot that confines a single electron below the surface of the chip. The photon, which is free to move within the full 7-millimeter span of the cavity, exchanges quantum information with the electron inside the double quantum dot. (Photo courtesy of the Jason Petta research group, Department of Physics)

The whole research project went on for five years with details of the passing of information from an electron to a photon disclosed just recently. The device used to do this was constructed by HRL Laboratories and is owned by General Motors and Boeing. Its simplistic design uses tow commonly used materials: silicon and silicon-germanium. Made from layers of silicon and nanowires placed at the top, these chips are great for transferring quantum information across. Photons were used as the medium for exchanging quantum information between electrons as they’re less sensitive to disruption and also have the ability to travel well through optic cables and circuits that could be used in a quantum supercomputer.


Jason Petta is a professor of physics at Princeton, and he says, “Just like in human interactions, to have good communication a number of things need to work out – it helps to speak the same language and so forth. We can bring the energy of the electronic state into resonance with the light particle so that the two can talk to each other.” So, hopefully, it won’t be too many more years we have to wait to see a quantum computer, but for now, it’s not quite there yet.


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