Abstract: A mixing and dispersing apparatus includes a tank body, a stirring part, a dispersing part, and a driving part. The tank body has an accommodating cavity configured to accommodate materials. The stirring part is disposed in the accommodating cavity and configured to mix the materials in the accommodating cavity. The dispersing part is disposed in the accommodating cavity and includes a first cylinder and a second cylinder. The first cylinder has a first cavity in communication with the accommodating cavity, the second cylinder is located in the first cavity, and the second cylinder has a second cavity in communication with the accommodating cavity. The driving part is connected to the stirring part and the dispersing part. The materials mixed in the accommodating cavity flow into the second cavity and flow out after being dispersed in the dispersing part.

Abstract: Techniques for quantum error correction of a multi-level system are provided and described. In some aspects, techniques for encoding a state of a multi-level quantum system include encoding a quantum information in a two-mode state of two quantum mechanical oscillators. Techniques for protecting the two-mode state against dephasing and energy loss are described.

Abstract: Provided is a force feedback apparatus, including a rotation shaft, a force feedback module fixed to the rotation shaft, and a trigger movably connected to the rotation shaft. The force feedback module includes a housing fixed to the rotation shaft and having a first opening and a force feedback assembly received in the housing. The force feedback assembly includes a sliding block, an ejector pin, a first driving element, a second driving element, and a transmission portion fixed to the sliding block and extending through the first opening to abut against the trigger. The first driving element interacts with the second driving element to drive the ejector pin to drive the transmission portion to move to realize force feedback on the trigger. The force feedback apparatus requires no additional transmission structure and directly provides force feedback for the trigger in a timely manner, thereby reducing the assembly difficulty.

Abstract: A machine learning method for model-free inference of target physical parameters from a metrology dataset is generally disclosed. The disclosed method is particularly applied to atomic interferometry for sensing/measuring physical quantities such as acceleration and rotations from measured atomic interference patterns. The method operates without a need for an exact measurement-dependent mathematical/analytical model and without a need for explicit knowledge of instrumental error processes that affect the measurement. The disclosed method is based on neural networks that are trained or calibrated to learn to simultaneously estimate the target physical quantities of interest and their measurement uncertainties. It extends the applicability of a metrology when instrumental precision is limited, and noise and imperfections are present.

Abstract: This disclosure relates to a method and system for efficiently and analytically generating spectra associated with transitions between thermal states in a multi-mode bosonic system using a classical algorithm to compute Fourier components of the transition spectra of the multi-mode bosonic system based on a representation space sampling method inspired by quantum Gaussian boson sampling followed by an inverse Fourier transform. The disclosed method and system particularly apply to efficient estimation of molecular vibronic spectra. For example, an exact solution of the Fourier components of molecular vibronic spectra at zero temperature may be analytically computed in a representation space by using, for example, a positive P-representation of the multi-mode bosonic vibronic quantum states of the molecule.

Abstract: Provided is a force feedback apparatus, including a housing, a rotation shaft fixed to the housing, a trigger movably connected to the rotation shaft and movable relative to the housing, and a force feedback assembly. The force feedback assembly includes a driving magnet fixed to a side of the trigger toward the housing, an iron core fixed to the housing and arranged opposite to the driving magnet, and a driving coil wound around the iron core. The driving coil is energized to interact with the driving magnet to generate force feedback on the trigger. The force feedback apparatus requires no additional transmission structure and directly provides force feedback through interaction between two driving elements, thereby realizing timely force feedback on the trigger and reducing the assembly difficulty while simplifying the structure. In addition, forces in two directions can be directly generated on the trigger by changing a driving current.

Abstract: The present disclosure discloses a force feedback device including a supporting bracket, a trigger hinged to the supporting bracket through a rotating shaft, a transmission shaft connected to the trigger, a driving assembly for providing an acting force to the trigger through the transmission shaft, and a reset member. A direction of the acting force is opposite to a direction of pulling the trigger. The driving assembly includes a magnetic circuit system and a coil fixed to the transmission shaft and generating an electromagnetic induction force with the magnetic circuit system. The electromagnetic induction force is transmitted to the trigger through the transmission shaft for forming the acting force. A handle using the force feedback device is also disclosed. The force feedback device and the handle disclosed by the present disclosure enable users to obtain richer game experiences according to different game scenarios.

Abstract: Quantum repeaters and network architectures use two concatenated quantum error correction codes to increase the transmission range of quantum information. A block of data qubits collectively encode a second-layer logical qubit according to a second-layer code concatenated with a first-layer code. A first-layer quantum repeater first-layer corrects each data qubit based on a first-layer syndrome extracted therefrom. The first-layer quantum repeater transmits these first-layer-corrected qubits to a second-layer quantum repeater via a quantum communication channel. The first-layer quantum repeater also transmits the first-layer syndromes to the second-layer quantum repeater via a classical communication channel. After extracting a second-layer syndrome from the first-layer-corrected qubits, the second-layer quantum repeater uses the first-layer syndromes and second-layer syndrome to second-layer correct the first-layer-corrected qubits.

Abstract: Techniques for providing hardware-efficient fault-tolerant quantum operations are provided. In some aspects a cavity and an ancilla transmon are used to implement a quantum operation by encoding a logical qubit using more than two energy levels of the cavity, encoding information using more than two energy levels of the ancilla transmon, and creating an interaction between the cavity and the ancilla transmon that decouples at least one error type in the ancilla transmon from the cavity.

Abstract: Techniques for implementing robust quantum logic gates are provided and described. In some aspects, a quantum logic gate between a plurality of cavities comprising a first cavity and a second cavity is implemented by performing a first beam splitter operation between the first cavity and the second cavity using a coupling transmon that is dispersively coupled to both the first cavity and the second cavity, and performing a controlled phase shift operation between the second cavity and an ancilla transmon that is dispersively coupled to the second cavity but not dispersively coupled to the first cavity.

Abstract: The present disclosure provides a system and a method for controlling motor parameters. The system includes a feedforward processing module performing a linear processing on a control signal according to parameters; a control object module including a DAC digital to analog converter, an amplifying circuit and an ADC analog to digital converter, a control signal processed by the feedforward processing module passing through the DAC digital to analog converter, and amplified by the amplifier circuit, and passing through the ADC analog to digital converter to obtain a voltage ?c·m[n] and a current ic·m[n] across the motor; a system identification module including an LMS adaptive filter, a Least mean square filtering performed on an error signal ?oei[n] between a measured current ic·m[n] and a prediction current ic·p[n], results of iteration feed back to the feedforward processing module, and the feedback results applied to the next data acquisitions and parameters calculations.

Abstract: Systems and methods for performing bosonic quantum error correction (QEC) using Gottesman-Kitaev-Preskill (GKP) states are provided. An ancilla quantum mechanical oscillator is used to probe Gaussian noise experienced by a data quantum mechanical oscillator without disturbing the state of the data quantum mechanical oscillator. The ancilla quantum mechanical oscillator is initialized with a GKP state and entangled with the state of a data quantum mechanical oscillator to correlate any noise experienced by the data state with the state of the ancilla quantum mechanical oscillator. The states are then disentangled, and momentum and position quadrature operators of the ancilla quantum mechanical oscillator are measured and used to perform QEC on the information stored in the data quantum mechanical oscillator.

Abstract: Techniques for implementing a QRAM by routing quantum information through multiple modes of a bosonic system are described. According to some aspects, a single bosonic system may be configured to maintain quantum information in a large number of independent modes at the same time. Suitable operations upon these modes may allow a quantum address value to be routed to modes associated with respective bits such that the only modes altered by the operations are those associated with the addresses being accessed. These modes may be operated upon based on the stored values then extracted to obtain the desired correlated superposition of the stored bit values in the addresses. The bits stored at the address locations may be classical bits, or may be qubits.

Abstract: Techniques are described in which a qubit is far off-resonantly, or dispersively, coupled to a quantum mechanical oscillator. In particular, a dispersive coupling between a physical qubit and a quantum mechanical oscillator may be selected such that control of the combined qubit-oscillator system can be realized. The physical qubit may be driven with an electromagnetic pulse (e.g., a microwave pulse) and the quantum mechanical oscillator simultaneously driven with another electromagnetic pulse, the combination of which results in a change in state of the qubit-oscillator system.

Abstract: The present disclosure provides a method for detecting a bandwidth of a linear vibration motor, including a linear vibration motor which comprises a housing and a motor vibrator. The method includes the following steps: step S1: setting a target displacement level of the linear vibration motor; step S2: measuring a displacement frequency response curve of the motor vibrator with reference to the target displacement level; step S3: comparing the displacement frequency response curve obtained in step S2 with a preset standard target displacement frequency response curve, determining whether the displacement frequency response curve is qualified, and if it is qualified, entering step S4; step S4: measuring a bandwidth of the linear vibration motor.

Abstract: A skid mounted device for upper-spreading internal diffusion vertical plug flow photocatalytic wastewater treatment includes internal diffusion vertical plug flow photocatalytic reaction tank groups and a skid base. The internal diffusion vertical plug flow photocatalytic reaction tank groups are arranged on the skid base. The internal diffusion vertical plug flow photocatalytic reaction tank groups are connected to each other in series, in parallel, or in series-parallel. Each internal diffusion vertical plug flow photocatalytic reaction tank group consists of two or more photocatalytic reaction tanks connected in series, in parallel, or in series-parallel. The wastewater pipes connected to the photocatalytic reaction tanks in each internal diffusion vertical plug flow photocatalytic reaction tank group are mounted above the photocatalytic reaction tanks.

Abstract: Disclosed are a gas sampling system and a gas sampling method for a fuel cell, a current density distribution estimation method for the fuel cell, a calibration method and a calibration device for an internal state model for the fuel cell, and a computer equipment. The gas sampling method for a fuel cell includes arranging a plurality of sampling pipelines and a plurality of sampling points, the plurality of sampling points being arranged at a cathode inlet, an anode outlet, an anode inlet, a cathode outlet, and in an anode flow channel, and a cathode flow channel of the fuel cell, the sampling points arranged in the anode flow channel and the cathode flow channel being located in central regions of cross sections of the flow channels, and the sampling pipelines being connected to the plurality of sampling points, respectively, and configured to guide gas inside the fuel cell out.

Abstract: Some aspects are directed to a method of operating an apparatus, the apparatus comprising a first quantum system having a plurality of coherent quantum states, the first quantum system being coupled to a second quantum system, the method comprising providing an input energy signal to the second quantum system that stimulates energy transfer between the first quantum system and the second quantum system and that causes net dissipation of energy to be output from the second quantum system, wherein the input energy signal includes at least two components having different frequencies and each having an amplitude and a phase, and adiabatically varying the amplitude and the phase of the at least two components of the input energy signal to cause a change in one or more of the plurality of coherent quantum states of the first quantum system.

Abstract: Some aspects are directed to a method of operating a circuit quantum electrodynamics system that includes a physical qubit dispersively coupled to a quantum mechanical oscillator, the method comprising measuring a parity of a first state of the quantum mechanical oscillator, subsequent to measuring the parity of the first state, measuring a parity of a second state of the quantum mechanical oscillator, the second state being different from the first state, applying a first drive waveform to the quantum mechanical oscillator, and applying a second drive waveform to the physical qubit concurrent with the application of the first drive waveform, wherein the first drive waveform and the second drive waveform are selected based at least in part on a result of comparing the measured parity of the second state to the measured parity of the first state.

Abstract: The present disclosure relates to a motor control system and method based on current feedback signal. The motor control system includes a control apparatus, a linear motor, and a current feedback apparatus, where an output end of the control apparatus is connected to the linear motor for calculating a displacement error of a previous moment to obtain a control output value of a current moment, and converting the control output value into a voltage signal for transmission to the linear motor; the linear motor is configured to vibrate according to the voltage signal input by the control apparatus; and the current feedback apparatus is connected to the linear motor, and is configured to: convert a measured current value of the linear motor into an actual displacement value of the current moment, and feed back the actual displacement value to an input end of the control apparatus.