## 1 Introduction  
Nonclassical states of light, which include the squeezed state of light and entangled state of light, play a pivotal role in research of quantum information and quantum communication [1; 2; 3; 4]. The squeezed state of light, whose quantum fluctuation of one quadrature component is reduced to a level below quantum noise limit (QNL), is widely applied in quantum teleportation, quantum computing, quantum metrology, and so on [5; 6; 7; 8; 9; 10; 11; 12; 13; 14]. With the development of quantum information research, the construction of a practical quantum information network has been an important goal in related fields [15; 16; 17]. With the help of a low-Earth orbit satellite \"Micius\", quantum teleportation in discrete variables has been realized in a more than 1000 kilometer distance [18]. On the other hand, it has been pointed out that the high-efficiency unconditional quantum information network at a metropolitan scale can be designed and built in continuous variables (CV) region with deterministic entangled or squeezed states of light [19]. But the nonclassical states of light are very sensitive to the loss and extra noise in the channel, the most protocols in CV region are demonstrated in very short distance [6; 20; 21; 22]. Therefore, an effective way for transferring a quantum state in a long-distance channel is necessary for the construction of CV quantum information network. Optical fiber and free space are two main quantum channels used for the exchange of long-distance quantum information [23; 24; 25; 26; 27; 28]. Optical fiber is the more suitable channel for the transmission of quantum information due to its lower loss and higher reliability. Recently, CV quantum key distributions (QKD) in ten-kilometer order have been realized with a modulated coherent state by several groups [29; 30; 31; 32; 33]. In the optical fiber channel, not only the loss but also the spurious noise in the fiber have to be considered for the transmission of a quantum state. Balance homodyne detection (BHD) is the most common detection method for measuring a CV quantum state, where the relative phase between quantum state and the corresponding local oscillator (LO) beam must remain relatively stable. Hence simultaneous transmission of a signal beam and the corresponding LO beam through a same fiber with orthogonal polarization has been widely implemented in many experiments [14; 27]. Nevertheless, there is always some excess noise loaded on the signal beam in the transmission process, and the main noise source in radio frequency is derived from guided acoustic wave Brillouin scattering (GAWBS) [34]. The stimulation of GAWBS noise is mainly due to the fluctuation of the density of optical fiber in time and space caused by the acoustic field, which results from the continuous thermal motion of the particles in the optical medium [34; 35]. In order to eliminate the influence of GAWBS noise as much as possible, the continuous signal beam and the corresponding LO beam are usually chopped into pulsed light by an amplitude electric-optic modulator (AM) and transmitted with time- and polarization-division multiplexing in CV QKD experiments [36; 37; 31; 38]. When the signal pulse and time-delayed LO pulse are not simultaneously transmitted in the fiber, the influence of GAWBS can be greatly removed. For example, in CV quantum teleportation, the entanglement state and the LO beam are continuously transmitted in the fiber channel, thus the communication distance is seriously influenced by the GAWBS noise [14]. The usual chopper tools for the light beam are AM and acousto-optic modulators (AOM). When the signal beam is transferred through an AM or AOM, the efficiency cannot reach 100%, which means that the quantum characteristics will be inevitably destroyed when the nonclassical state is the signal beam and is transferred with this method. Here we present a more practical protocol for the transferring of quantum state without introducing the extra loss and noise to the signal beam.