Abstract

Systems and methods for performing an entangling gate between a first dual-rail qubit and a second dual-rail qubit are described herein. The techniques described herein may leverage static non-linear interactions (e.g., static cross Kerr interactions) to perform entangling gates using coupled dual-rail qubits. The entangling gates may be performed by applying one or more drive waveforms to exchange encoded states of quantum oscillators in the dual-rail qubits to turn the non-linear interactions "on" and "off."

IPC Classes  ?

• G06N 10/40 - Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control
• G06N 10/20 - Models of quantum computing, e.g. quantum circuits or universal quantum computers

Goods & Services

Quantum computers and parts thereof Consulting services in the field of quantum computing; Providing temporary use of online non-downloadable cloud-based software for access to quantum computing environments

Abstract

A resistive flex microwave attenuator for coupling control signals to a quantum computational hardware system includes a set of planar transmission lines, each such planar transmission line having first and second ends along a longitudinal axis. Each such planar transmission line includes: a set of ground planes disposed in a direction parallel to the longitudinal axis; a dielectric disposed in a direction parallel to the longitudinal axis and in contact with the set of ground planes; a signal line disposed in a direction parallel to the longitudinal axis and in contact with the set of ground planes; a metallic layer disposed around the set of ground planes; an input, coupled to such planar transmission line at the first end, and configured to receive the control signals; and an output, coupled to such planar transmission line at the second end, and configured for coupling to the quantum computational hardware system. At least one member selected from the group consisting of a ground plane of the set of ground planes and the signal line is resistive to provide attenuation. The set of planar transmission lines has a geometry configured for dissipation of heat, attributable to energy provided at the input, in a manner distributed along a length of the set of planar transmission lines. The set of planar transmission lines provide attenuation, without recourse to discrete components, across a desired frequency band. If there are a plurality of planar transmission lines, the set of planar transmission lines is disposed so that their respective ground planes are approximately coincident

IPC Classes  ?

• H01P 1/22 - Attenuating devices

Abstract

An interface between cryogenic computational hardware and room temperature computational hardware includes a plurality of discrete stages, including a first stage at room temperature and a last stage at a cryogenic temperature. Each successive stage is configured for operation at a corresponding refrigeration temperature that is lower than the refrigeration temperature of each preceding stage and includes a set of planar transmission lines. The transmission lines of any given stage other than the first stage are proximally coupled to and contiguous with the transmission lines of an immediately preceding stage. The transmission lines of the first stage are proximally coupled to the room temperature computational hardware, and the transmission lines of the last stage are proximally coupled to the cryogenic computational hardware. Each stage has shielding configured to block electromagnetic radiation external to such stage.

IPC Classes  ?

• H01P 3/00 - WaveguidesTransmission lines of the waveguide type
• H01P 1/30 - Auxiliary devices for compensation of, or protection against, temperature or moisture effects
• G06N 10/40 - Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control
• H05K 1/18 - Printed circuits structurally associated with non-printed electric components
• H01B 12/00 - Superconductive or hyperconductive conductors, cables or transmission lines