1,852 research outputs found

    Canonical interpretation of Y(10750)Y(10750) and Υ(10860)\Upsilon(10860) in the Υ\Upsilon family

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    Inspired by the new resonance Y(10750)Y(10750), we calculate the masses and two-body OZI-allowed strong decays of the higher vector bottomonium sates within both screened and linear potential models. We discuss the possibilities of Υ(10860)\Upsilon(10860) and Y(10750)Y(10750) as mixed states via the SDS-D mixing. Our results suggest that Y(10750)Y(10750) and Υ(10860)\Upsilon(10860) might be explained as mixed states between 5S5S- and 4D4D-wave vector bbˉb\bar{b} states. The Y(10750)Y(10750) and Υ(10860)\Upsilon(10860) resonances may correspond to the mixed states dominated by the 4D4D- and 5S5S-wave components, respectively. The mass and the strong decay behaviors of the Υ(11020)\Upsilon(11020) resonance are consistent with the assignment of the Υ(6S)\Upsilon(6S) state in the potential models.Comment: 9 pages, 4 figures. More discussions are adde

    Quantum memory and non-demolition measurement of single phonon state with nitrogen-vacancy centers ensemble

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    In diamond, the mechanical vibration induced strain can lead to interaction between the mechanical mode and the nitrogen-vecancy (NV) centers. In this work, we propose to utilize the strain induced coupling for the quantum non-demolition (QND) single phonon measurement and memory in diamond. The single phonon in a diamond mechanical resonator can be perfectly absorbed and emitted by the NV centers ensemble (NVE) with adiabatically tuning the microwave driving. An optical laser drives the NVE to the excited states, which have much larger coupling strength to the mechanical mode. By adiabatically eliminating the excited states under large detuning limit, the effective coupling between the mechanical mode and the NVE can be used for QND measurement of the single phonon state. Under realistic experimental conditions, we numerically simulate the scheme. It is found that the fidelity of the absorbing and emitting process can reach a much high value. The overlap between the input and the output phonon shapes can reach 98.57%98.57\%.Comment: 7 pages, 3 figure