Pseudo-pure state(PPS)preparation is crucial in nuclear magnetic resonance quantum computation.There have been some methods in spin-1/2 systems and a few attempts in quadrupolar spin systems.As optimal control via gra...Pseudo-pure state(PPS)preparation is crucial in nuclear magnetic resonance quantum computation.There have been some methods in spin-1/2 systems and a few attempts in quadrupolar spin systems.As optimal control via gradient ascent pulses engineering(GRAPE)has been widely used in quantum information science,we apply this technique to PPS preparation in quadrupolar spin systems.This approach shows an effective and fast quantum control method for both the state preparation and the realization of quantum gates in quadrupolar systems.展开更多
We present the experimental realization of this gate with a solution of chlorostyrene molecules. Our method does not depend heavily on the two-qubit controlled operation, which used to serve as the basic quantum opera...We present the experimental realization of this gate with a solution of chlorostyrene molecules. Our method does not depend heavily on the two-qubit controlled operation, which used to serve as the basic quantum operation in quantum computing. At present, we use transition operator that can be applied to all qubits in one operation. It appears that no experimental realization has yet been reported up to now regarding the implementation of quantum Toffoli gate using transition pulse on three-qubit nuclear magnetic resonance quantum computers. In addition, our method is experimentally convenient to be extended to more qubits.展开更多
Using nuciear magnetic resonance techniques with a solution of cytosine molecules,we show an implementation of certain quantum logic gates(including NOT gate,square-root of NOT gate and controlled~NOT gate),which have...Using nuciear magnetic resonance techniques with a solution of cytosine molecules,we show an implementation of certain quantum logic gates(including NOT gate,square-root of NOT gate and controlled~NOT gate),which have central importance in quantum computing.In addition,experimental results show that nuclear magnetic resonance spectroscopy can efHciently measure the resuit of quantum computing without attendant wave-function collapse.展开更多
The reduced sputtering yield (y_(n)^(R)) of materials induced by fast neutron is presented. Based on the experimental (y_(n)^(R)) results for (n, 2n), (n, p), (n, α) and (n, np) reactions, the value of (y_(n)^(R)) fo...The reduced sputtering yield (y_(n)^(R)) of materials induced by fast neutron is presented. Based on the experimental (y_(n)^(R)) results for (n, 2n), (n, p), (n, α) and (n, np) reactions, the value of (y_(n)^(R)) for (n, non-elastic) reaction is deduced by using data of cross sections in JENDL-3.2 and ENDF/B-VI. The value of (y_(n)^(R)) for (n, n) reaction is predicted by relation between (y_(n)^(R)) and the mean projected ranges of recoil nuclides. Combining both (y_(n)^(R)) for (n, n) and (n, non-elastic) reactions, the total (y_(n)^(R)) is obtained. Systematics of (y_(n)^(R)) for (n, non-elastic), (n, n) and (n, total) reactions have been demonstrated.展开更多
基金Supported by the Chinese Academy of Sciences,and the National Natural Science Foundation of China under Grant Nos 10975124,10834005,91021005.
文摘Pseudo-pure state(PPS)preparation is crucial in nuclear magnetic resonance quantum computation.There have been some methods in spin-1/2 systems and a few attempts in quadrupolar spin systems.As optimal control via gradient ascent pulses engineering(GRAPE)has been widely used in quantum information science,we apply this technique to PPS preparation in quadrupolar spin systems.This approach shows an effective and fast quantum control method for both the state preparation and the realization of quantum gates in quadrupolar systems.
基金Supported by the National Natural Science Foundation of China under Grant Nos.10075041 and 10075044the Science Foundation of USTC for Young Scientists.
文摘We present the experimental realization of this gate with a solution of chlorostyrene molecules. Our method does not depend heavily on the two-qubit controlled operation, which used to serve as the basic quantum operation in quantum computing. At present, we use transition operator that can be applied to all qubits in one operation. It appears that no experimental realization has yet been reported up to now regarding the implementation of quantum Toffoli gate using transition pulse on three-qubit nuclear magnetic resonance quantum computers. In addition, our method is experimentally convenient to be extended to more qubits.
基金Supported by the National Natural Science Foundation of China under Grant No.19875050,and the Science Foundation of Chinese Academy of Sciences.
文摘Using nuciear magnetic resonance techniques with a solution of cytosine molecules,we show an implementation of certain quantum logic gates(including NOT gate,square-root of NOT gate and controlled~NOT gate),which have central importance in quantum computing.In addition,experimental results show that nuclear magnetic resonance spectroscopy can efHciently measure the resuit of quantum computing without attendant wave-function collapse.
基金the Returned Scientists1 Foundation of Chinese Academy of Sciences。
文摘The reduced sputtering yield (y_(n)^(R)) of materials induced by fast neutron is presented. Based on the experimental (y_(n)^(R)) results for (n, 2n), (n, p), (n, α) and (n, np) reactions, the value of (y_(n)^(R)) for (n, non-elastic) reaction is deduced by using data of cross sections in JENDL-3.2 and ENDF/B-VI. The value of (y_(n)^(R)) for (n, n) reaction is predicted by relation between (y_(n)^(R)) and the mean projected ranges of recoil nuclides. Combining both (y_(n)^(R)) for (n, n) and (n, non-elastic) reactions, the total (y_(n)^(R)) is obtained. Systematics of (y_(n)^(R)) for (n, non-elastic), (n, n) and (n, total) reactions have been demonstrated.
