Abstract: Disclosed are a method and apparatus for realizing a quantum operation. According to embodiments of the present disclosure, an ion qubit containing a first set of long-lived energy levels and a second set of long-lived energy levels is selected, wherein each of the first set of long-lived energy levels and the second set of long-lived energy levels contains two or more than two sub-energy levels for qubit encoding; a second continuous-wave laser beam containing two frequency components, which is used for coherent transfer between different sets of long-lived energy levels and construction of a single-qubit gate and a two-qubit gate, is obtained by performing frequency adjustment on a first continuous-wave laser beam; parameter adjustment is performed on the second continuous-wave laser beam according to a quantum operation to be performed to obtain a corresponding laser beam for performing the quantum operation according to quantum operation to be performed.

Abstract: An addressing system, an addressing apparatus and a computing apparatus are provided. The addressing system includes a first acousto-optic processing component and a second acousto-optic processing component. The first acousto-optic processing component is used for generating a diffraction beam for an addressing operation in a preset number of dimensions. The second acousto-optic processing component is used for determining emitting directions of the generated diffraction beam in various dimensions, and outputting a diffraction beam according to the determined emitting directions to perform an addressing operation for a qubit array in the preset number of dimensions. A first radio frequency of the diffraction beam generated by the first acousto-optic processing component is used for compensating for a second radio frequency of diffraction beams outputted by the second acousto-optic processing component from different emitting directions.

Abstract: The present disclosure discloses an addressing manipulation system and an addressing manipulation method. The addressing manipulation system includes a control unit, a radio frequency driving unit and two addressing units. The control unit controls a frequency and polarization of an incident laser beam in real time, so that the incident laser beams meet the Raman transition condition. The radio frequency driving unit controls the number and frequencies of radio frequency driving fields applied to each addressing unit, and achieves the control of the number and angles of the emergent laser beams and a frequency difference of the emergent laser beam pair. The addressing unit receives and modulates the incident laser beam and outputs a preset number of the emergent laser beams for addressing manipulation, wherein the emergent laser beam is one laser beam of the emergent laser beam pair for addressing manipulation.

Abstract: A dual-type qubit system, a quantum network based on the dual-type qubit system and a construction method thereof are provided. The dual-type qubit system includes two types of qubits. The two types of gubits, with different functions, are implemented by the same species of ions. The ion has at least two sets of long-lived energy levels. The two types of qubits, carried by spectrally different sets of long-lived energy levels of the ions, are convertible to each other.

Abstract: An addressing system, an addressing apparatus and a computing apparatus are provided. The addressing system includes a first acousto-optic processing component and a second acousto-optic processing component. The first acousto-optic processing component is used for generating a diffraction beam for an addressing operation in a preset number of dimensions. The second acousto-optic processing component is used for determining emitting directions of the generated diffraction beam in various dimensions, and outputting a diffraction beam according to the determined emitting directions to perform an addressing operation for a qubit array in the preset number of dimensions. A first radio frequency of the diffraction beam generated by the first acousto-optic processing component is used for compensating for a second radio frequency of diffraction beams outputted by the second acousto-optic processing component from different emitting directions.

Abstract: The invention provides systems and methods enabling high fidelity quantum communication over long communication channels even in the presence of significant loss in the channels. The invention involves laser manipulation of quantum correlated atomic ensembles using linear optic components (110, 120), optical sources of low intensity pulses (10), interferers in the form of beam splitters (150), and single-photon detectors (180, 190) requiring only moderate efficiencies. The invention provides fault-tolerant entanglement generation and connection using a sequence of steps that each provide built-in entanglement purification and that are each resilient to realistic noise levels. The invention relies upon collective rather single particle excitations in atomic ensembles and results in communication efficiency scaling polynomially with the total length of the communication channel.

Abstract: Methods and apparatus for long-distance quantum communication and scalable quantum computation are disclosed. The methods and apparatus are based on probabilistic ion-photon mapping. Scalable quantum computation is achieved by forming deterministic quantum gates between remotely located trapped ions by detecting spontaneously emitted photons, accompanied by local Coulomb interaction between neighboring ions. Long-distance quantum communication and scalable quantum communication networks formed by employing a number of remote nodes that each include an ion trap and by employing probabilistic photon-mediated entanglement between the ions in each ion trap.

Abstract: The invention provides systems and methods enabling high fidelity quantum communication over long communication channels even in the presence of significant loss in the channels. The invention involves laser manipulation of quantum correlated atomic ensembles using linear optic components (110, 120), optical sources of low intensity pulses (10), interferers in the form of beam splitters (150), and single-photon detectors (180, 190) requiring only moderate efficiencies. The invention provides fault-tolerant entanglement generation and connection using a sequence of steps that each provide built-in entanglement purification and that are each resilient to realistic noise levels. The invention relies upon collective rather single particle excitations in atomic ensembles and results in communication efficiency scaling polynomially with the total length of the communication channel.

Abstract: Apparatus and methods for high fidelity quantum communication over long communication channels even in the presence of significant loss in the channels are disclosed. The invention employs laser manipulation of quantum correlated atomic ensembles using linear optic components, optical sources of low intensity pulses, beam splitters, and single-photon detectors requiring only moderate efficiencies. The invention provides fault-tolerant entanglement generation and connection, using a sequence of steps that each provide built-in entanglement purification and that are each resilient to the realistic noise. The invention relies upon collective excitation in atomic ensembles rather than single particle excitations in atomic ensembles so that communication efficiency scales polynomially with the total length of a communication channel.

Abstract: Methods and apparatus for long-distance quantum communication and scalable quantum computation are disclosed. The methods and apparatus are based on probabilistic ion-photon mapping. Scalable quantum computation is achieved by forming deterministic quantum gates between remotely located trapped ions by detecting spontaneously emitted photons, accompanied by local Coulomb interaction between neighboring ions. Long-distance quantum communication and scalable quantum communication networks formed by employing a number of remote nodes that each include an ion trap and by employing probabilistic photon-mediated entanglement between the ions in each ion trap.

Abstract: The invention provides systems and methods enabling high fidelity quantum communication over long communication channels even in the presence of significant loss in the channels comprising laser manipulation of quantum correlated atomic ensembles using linear optic components (110, 120), optical sources of low intensity pulses (10), beam splitters (150), single-photon detectors (180, 190) requiring only moderate efficiencies. The invention provides fault-tolerant entanglement generation, connection, using a sequence of steps that each provide built-in entanglement purification and are each resilient to the realistic noise. The invention relies upon collective rather single particle excitations in atomic ensembles and result in communication efficiency scaling polynomially with the total length of a communication channel.