Transferring entangled states between matter qubits and microwave-field(or optical-field)qubits is of fundamental interest in quantum mechanics and necessary in hybrid quantum information processing and quantum commun...Transferring entangled states between matter qubits and microwave-field(or optical-field)qubits is of fundamental interest in quantum mechanics and necessary in hybrid quantum information processing and quantum communication.We here propose a way for transferring entangled states between superconducting qubits(matter qubits)and microwave-field qubits.This proposal is realized by a system consisting of multiple superconducting qutrits and microwave cavities.Here,“qutrit”refers to a three-level quantum system with the two lowest levels encoding a qubit while the third level acting as an auxiliary state.In contrast,the microwave-field qubits are encoded with coherent states of microwave cavities.Because the third energy level of each qutrit is not populated during the operation,decoherence from the higher energy levels is greatly suppressed.The entangled states can be deterministically transferred because measurement on the states is not needed.The operation time is independent of the number of superconducting qubits or microwave-field qubits.In addition,the architecture of the circuit system is quite simple because only a coupler qutrit and an auxiliary cavity are required.As an example,our numerical simulations show that high-fidelity transfer of entangled states from two superconducting qubits to two microwave-field qubits is feasible with present circuit QED technology.This proposal is quite general and can be extended to transfer entangled states between other matter qubits(e.g.,atoms,quantum dots,and NV centers)and microwave-or optical-field qubits encoded with coherent states.展开更多
This paper puts forward a method for abdomen panorama reconstruction based on a stereo vision system. For the purpose of recovering the abdomen completely and accurately under the condition of actual photographing wit...This paper puts forward a method for abdomen panorama reconstruction based on a stereo vision system. For the purpose of recovering the abdomen completely and accurately under the condition of actual photographing with illumination variance and blur noise, some innovative combined feature descriptors are presented on the basis of Hu-moment invariants. Furthermore, considering the study on the abdomen surface reconstruction, a circle template which is divided into 6 sectors is designed. It is noted that a descriptor merely using gray intensity is not able to provide sufficient information for feature description. Consequently, the sector entropy which denotes the structure characteristics is drawn into the feature descriptor. By means of the combined effect of the gray intensity and the sector entropy, the similarity measurement is conducted for the final abdomen reconstruction. The experimental results reveal that the proposed method can acquire a high precision of abdomen reconstruction similar to the 3D scanner. This stereo vision system has wide practicability in the field of clothing.展开更多
基金supported by the Key-Area Research and Development Program of Guang Dong Province(Grant No.2018B030326001)the National Natural Science Foundation of China(NSFC)(Grant Nos.12004253,11074062,11374083,11774076,11804228,11965017,and U21A20436)the Jiangxi Natural Science Foundation(Grant Nos.20192ACBL20051,20212BAB211019,and 20212BAB201025).
文摘Transferring entangled states between matter qubits and microwave-field(or optical-field)qubits is of fundamental interest in quantum mechanics and necessary in hybrid quantum information processing and quantum communication.We here propose a way for transferring entangled states between superconducting qubits(matter qubits)and microwave-field qubits.This proposal is realized by a system consisting of multiple superconducting qutrits and microwave cavities.Here,“qutrit”refers to a three-level quantum system with the two lowest levels encoding a qubit while the third level acting as an auxiliary state.In contrast,the microwave-field qubits are encoded with coherent states of microwave cavities.Because the third energy level of each qutrit is not populated during the operation,decoherence from the higher energy levels is greatly suppressed.The entangled states can be deterministically transferred because measurement on the states is not needed.The operation time is independent of the number of superconducting qubits or microwave-field qubits.In addition,the architecture of the circuit system is quite simple because only a coupler qutrit and an auxiliary cavity are required.As an example,our numerical simulations show that high-fidelity transfer of entangled states from two superconducting qubits to two microwave-field qubits is feasible with present circuit QED technology.This proposal is quite general and can be extended to transfer entangled states between other matter qubits(e.g.,atoms,quantum dots,and NV centers)and microwave-or optical-field qubits encoded with coherent states.
基金supported by National Natural Science Foundation of China(No.61462046)Jiangxi Province Education Department of Science and Technology(Nos.GJJ13539,GJJ12465,GJJ13553,GJJ14558 and GJJ14559)+1 种基金Jiangxi Province Science and Technology(No.20123BBE50076)Jinggangshan University Doctoral Scientific Research Foundation(No.20111101)
文摘This paper puts forward a method for abdomen panorama reconstruction based on a stereo vision system. For the purpose of recovering the abdomen completely and accurately under the condition of actual photographing with illumination variance and blur noise, some innovative combined feature descriptors are presented on the basis of Hu-moment invariants. Furthermore, considering the study on the abdomen surface reconstruction, a circle template which is divided into 6 sectors is designed. It is noted that a descriptor merely using gray intensity is not able to provide sufficient information for feature description. Consequently, the sector entropy which denotes the structure characteristics is drawn into the feature descriptor. By means of the combined effect of the gray intensity and the sector entropy, the similarity measurement is conducted for the final abdomen reconstruction. The experimental results reveal that the proposed method can acquire a high precision of abdomen reconstruction similar to the 3D scanner. This stereo vision system has wide practicability in the field of clothing.