A quantum system includes a qubit array comprising a plurality of qubits. A bus resonator is coupled between at least one pair of qubits in the qubit array. A switch is coupled between the at least one qubit pair of qubits.

A quantum processing unit is disclosed. The quantum processing unit includes at least one superconducting qubit that is based on phase-biased linear and non-linear inductive-energy elements. A superconducting phase difference across the linear and non-linear inductive-energy elements is biased, for example, by an external magnetic field, such that quadratic potential energy terms of the linear and non-linear inductive-energy elements are cancelled at least partly. In a preferred embodiment, such cancellation is at least 30%. The partial cancellation of the quadratic potential energy terms makes it possible to implement a high-coherence high-anharmonicity superconducting qubit design.

A qubit memory of a quantum computer is provided. The qubit memory according to an embodiment includes a first readout unit, a first transmon, and a first data storage unit storing quantum information, and the first data storage unit includes a first superconducting waveguide layer, an insulating layer, and a superconductor layer sequentially stacked on a substrate. In one example, the first superconducting waveguide layer may include a superconducting resonator.

A resonator constructed with one or more Van der Waals materials. In some embodiments, a system includes such a resonator. The resonator may include: a capacitor; and an inductor, the capacitor including: a first conductive layer; an insulating layer, on the first conductive layer; and a second conductive layer on the insulating layer, the first conductive layer being composed of one or more layers of a first van der Waals material, the insulating layer being composed of one or more layers of a second van der Waals material, and the second conductive layer being composed of one or more layers of a third van der Waals material.

Methods, apparatuses, and devices for quantum chip preparation include acquiring a coplanar waveguide in a quantum chip; and establishing a connecting bridge on the coplanar waveguide using a bonding machine, wherein the connecting bridge is configured to connect a first reference ground and a second reference ground located on two sides of the coplanar waveguide to change the chip electromagnetic resonance frequency. A quantum chip includes a transmission line configured for signal transmission; and a resonant cavity coupled to the transmission line and configured to regulate an operating state of qubits on the quantum chip, wherein the transmission line and the resonant cavity are both composed of a coplanar waveguide, the coplanar waveguide is provided with a connecting bridge, and the connecting bridge is configured to connect a first reference ground and a second reference ground on two sides of the coplanar waveguide to change the chip electromagnetic resonance frequency.

A NEMS readout system includes a sensor array comprising a plurality of sensors. Each sensor of the plurality of sensors including a resonator with frequency characteristics different from the resonator of each other sensor of the plurality of sensors. A readout signal indicative of a plurality of output signals is collected from the sensor array. Each output signal of the plurality of output signals corresponding to one of the plurality of sensors. An analysis of the plurality of output signals is performed to identify a plurality of resonant frequencies and to detect a frequency shift associated with at least one of the plurality of resonant frequencies.

Provided is a print circuit board including: a ground conductor layer; a pair of strip conductors extending along a first orientation; a first resonator conductor three-dimensionally intersecting with the pair of strip conductors along a second orientation; a pair of first via holes connecting the first resonator conductor and the ground conductor layer; and a dielectric layer including the first resonator conductor therein, and being disposed between the ground conductor layer and the pair of the strip conductors. A distance H.sub.1 between the pair of strip conductors and the ground conductor layer is twice or more a distance H.sub.2 between the pair of strip conductors and the first resonator conductor, and a line length L of the first resonator conductor is 0.4 wavelength or more and 0.6 wavelength or less at a frequency corresponding to the bit rate.

A quantum processing unit is disclosed. The quantum processing unit includes at least one superconducting qubit that is based on phase-biased linear and non-linear inductive-energy elements. A superconducting phase difference across the linear and non-linear inductive-energy elements is biased, for example, by an external magnetic field, such that quadratic potential energy terms of the linear and non-linear inductive-energy elements are cancelled at least partly. In a preferred embodiment, such cancellation is at least 30%. The partial cancellation of the quadratic potential energy terms makes it possible to implement a high-coherence high-anharmonicity superconducting qubit design.

A method for manufacturing a superconducting LC-type resonator of the type including at least one high-resistivity substrate on which are printed an inductive meander, a first so-called lower electrode and a second so-called upper electrode arranged opposite the first so as to form together a capacitor connected in parallel with the inductive meander, as well as inductive coupling means dedicated to the resonator, in which a sacrificial aluminium layer is deposited between the first and second electrodes. Also disclosed is the superconducting LC-type resonator thus obtained and the use of such a resonator for detecting the noise of a millimetre photon.

A quantum processing unit is disclosed. The quantum processing unit includes at least one superconducting qubit based on phase-biased linear and non-linear inductive-energy elements. A superconducting phase difference across the linear and non-linear inductive-energy elements is biased, for example, by an external magnetic field, such that quadratic potential energy terms of the linear and non-linear inductive-energy elements are cancelled at least partly. In a preferred embodiment, such cancellation is at least 30%. The partial cancellation of the quadratic potential makes it possible to implement a high-coherence high-anharmonicity superconducting qubit design.