They utilized hexagonal boron nitride to assemble an equal plate capacitor for a qubit. To manufacture the capacitor, they sandwiched hexagonal boron nitride between extremely meager layers of another van der Waals material, niobium diselenide.
The complicated creation process included setting one up iota thick layers of the materials under a magnifying lens and afterward utilizing a tacky polymer to snatch each layer and stack it on top of the other. They set the tacky polymer, with the heap of 2D materials, onto the qubit circuit, then, at that point, softened the polymer and washed it away.
Then, at that point, they associated the capacitor to the current construction and cooled the qubit to 20 millikelvins (- 273.13 C).
“Probably the greatest test of the creation interaction is working with niobium diselenide, which will oxidize in short order on the off chance that it is presented to the air. To stay away from that, the entire get together of this construction must be done in what we call the glove box, which is a major box loaded up with argon, which is a latent gas that contains an exceptionally low degree of oxygen. We need to do everything inside this crate,” Wang says.
The subsequent qubit is multiple times less than whatever they made with customary strategies on a similar chip. The intelligibility time, or lifetime, of the qubit is a couple of microseconds more limited with their new plan. What’s more capacitors worked with hexagonal boron nitride contain in excess of 90% of the electric field between the upper and lower plates, which recommends they will fundamentally stifle cross-talk among adjoining qubits, Wang says. This work is integral to late research by a group at Columbia University and Raytheon.
Later on, the specialists need to utilize this strategy to fabricate numerous qubits on a chip to check that their procedure lessens cross-talk. They additionally need to work on the presentation of the qubit by finetuning the manufacture interaction, or in any event, assembling the whole qubit out of 2D materials.
“Presently we have made a way to show that you can securely use as much hexagonal boron nitride as you need without agonizing a lot over absconds. This opens up a ton of chance where you can make a wide range of various heterostructures and join it with a microwave circuit, and there is much more space that you can investigate. As it were, we are giving individuals the go-ahead – you can involve this material in any capacity you need without stressing a lot over the misfortune that is related with the dielectric,” Wang says.