Research Publications Archive

The latest in Quantum Thinking

Entanglement across separate silicon dies in a modular superconducting qubit device

We demonstrate a modular solid state architecture with deterministic inter-module coupling between four physically separate, interchangeable superconducting qubit integrated circuits.

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Systems R&D 07.05.19

Integrating high-density microwave signalling and packaging with superconducting qubits

Using RF flexible circuits to increase signal density in the dilution refrigerator and package while maintaining signal integrity.

Algorithms & Applications 23.04.19

Fixed-depth two-qubit circuits and the monodromy polytope

We highlight a certain member of the "XY-family" for which many two-qubit programs admit expression as low-depth circuits.

Systems R&D 24.01.19

Manufacturing low dissipation superconducting quantum processors

For superconducting qubits, uncontrolled variation of nominal performance makes obtaining such resolution challenging. We approach this problem by investigating specific combinations of previously reported fabrication techniques on the quality of 242 thin film superconducting resonators and qubits.

Systems R&D 23.01.19

Demonstration of a parametrically-activated entangling gate protected from flux noise

We experimentally validate the existence of this AC sweet spot and demonstrate its dependence on white noise power from room temperature electronics.

Systems R&D 24.09.18

Parametrically-activated entangling gates using transmon qubits

We describe and implement a family of entangling gates activated by radio-frequency flux modulation applied to a tunable transmon that is statically coupled to a neighboring transmon.

Systems R&D 03.07.18

AC flux sweet spots in parametrically-modulated superconducting qubits

We find that simple filtering of the flux control signal allows for entangling gates to operate in a novel sweet-spot for dephasing under flux modulation.

Systems R&D 02.02.18

Demonstration of universal parametric entangling gates on a multi-qubit lattice

We show that parametric coupling techniques can be used to generate selective entangling interactions for multi-qubit processors.

Systems R&D 15.08.17

Superconducting through-silicon vias for quantum integrated circuits

We describe a microfabrication process for superconducting through-silicon vias appropriate for use in superconducting qubit quantum processors.

Systems R&D 15.08.17

Superconducting caps for quantum integrated circuits

We report on the fabrication and metrology of superconducting caps for qubit circuits.

Systems R&D 07.08.17

Charge and flux insensitive tunable superconducting qubit

We propose a flux-tunable superconducting qubit that minimizes the dephasing due to magnetic flux noise by engineering controllable flux “sweet spots” at frequencies of interest.

Systems R&D 20.06.17

Analytical modeling of parametrically-modulated transmon qubits

We focus on superconducting quantum processors based on transmons for which full numerical simulations are already challenging at the level of qubytes.

Systems R&D 10.11.16

A functional architecture for scalable quantum computing

We describe such a functional architecture, based on a planar lattice of transmon and fluxonium qubits, parametric amplifiers, and a novel fast DC controlled two-qubit gate.

Displaying 61–72 of 73 results