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When the computer is operational, five casings (like the white one shown at the top of the image) envelop the machine. These cans nest inside each other and act as thermal shields, keeping everything super cold and vacuum-sealed inside.
These photon-carrying cables deliver signals to and from the chip to drive qubit operations and return the measured results.
Beneath the heat exchangers sits the “mixing chamber.” Inside, different forms of liquid helium—helium-3 and helium-4—separate and evaporate, diffusing the heat.
These gold plates separate cooling zones. At the bottom, they plunge to one-hundredth of a Kelvin—hundreds of times as cold as outer space.
The QPU (quantum processing unit) features a gold-plated copper disk with a silicon chip inside that contains the machine’s brain.
We present a novel transmon qubit fabrication technique that yields systematic improvements in T1 coherence times. We fabricate devices using an encapsulation strategy that involves passivating the surface of niobium and thereby preventing the formation of its lossy surface oxide.
Learn MoreWe consider the approximate state estimation of readout-mitigated expectation values, and how to best implement that procedure on the Rigetti quantum computing hardware. We discuss the theoretical aspects involved, providing an explicit computation of the effect of readout error on the estimated expectation values and how to mitigate that effect.
Learn MoreWhat is the optimal circuit depth that provides the best solution? Here, we address this question by investigating an adiabatic circuit that interpolates between the paramagnetic and ferromagnetic ground states of the one-dimensional quantum Ising model.
Learn MoreThe quantum-classical algorithm systematically outperforms its classical counterpart, signaling a quantum enhancement with respect to its guaranteed output quality. Moreover, we observe an absolute performance comparable with the guarantees for a state-of-the-art semi-definite programming method.
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