We theoretically study the quantum Fisher information（QFI） of the SU（1,1） interferometer with phase shifts in two arms by coherent squeezed vacuum state input, and give the comparison with the result of phase shi...We theoretically study the quantum Fisher information（QFI） of the SU（1,1） interferometer with phase shifts in two arms by coherent squeezed vacuum state input, and give the comparison with the result of phase shift only in one arm.Different from the traditional Mach–Zehnder interferometer, the QFI of single-arm case for an SU（1,1） interferometer can be slightly higher or lower than that of two-arm case, which depends on the intensities of the two arms of the interferometer.For coherent squeezed vacuum state input with a fixed mean photon number, the optimal sensitivity is achieved with a squeezed vacuum input in one mode and the vacuum input in the other.展开更多
Quantum teleportation allows the transmission of quantum states over arbitrary distances and is an applied tool in quantum computation and communication.This paper theoretically addresses the feasibility of quantum te...Quantum teleportation allows the transmission of quantum states over arbitrary distances and is an applied tool in quantum computation and communication.This paper theoretically addresses the feasibility of quantum teleportation based on a single semiconductor quantum dot influenced by pure dephasing through the biexciton cascade decay.We also investigate the idea of remote sensing in quantum teleportation affected by pure dephasing.In particular,we compare the quality of quantum teleportation in single-and two-qubit schemes and show that,within the present model,single-qubit quantum teleportation has a quantum advantage.Finally,to investigate the dynamics of the system,we introduce important witnesses of the non-Markovian dynamics of the system,so that our results may solve outstanding problems in the realization of faithful quantum teleportation over a long time.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11474095,11654005,and 11234003)the National Key Research and Development Program of China(Grant No.2016YFA0302000)
文摘We theoretically study the quantum Fisher information（QFI） of the SU（1,1） interferometer with phase shifts in two arms by coherent squeezed vacuum state input, and give the comparison with the result of phase shift only in one arm.Different from the traditional Mach–Zehnder interferometer, the QFI of single-arm case for an SU（1,1） interferometer can be slightly higher or lower than that of two-arm case, which depends on the intensities of the two arms of the interferometer.For coherent squeezed vacuum state input with a fixed mean photon number, the optimal sensitivity is achieved with a squeezed vacuum input in one mode and the vacuum input in the other.
文摘Quantum teleportation allows the transmission of quantum states over arbitrary distances and is an applied tool in quantum computation and communication.This paper theoretically addresses the feasibility of quantum teleportation based on a single semiconductor quantum dot influenced by pure dephasing through the biexciton cascade decay.We also investigate the idea of remote sensing in quantum teleportation affected by pure dephasing.In particular,we compare the quality of quantum teleportation in single-and two-qubit schemes and show that,within the present model,single-qubit quantum teleportation has a quantum advantage.Finally,to investigate the dynamics of the system,we introduce important witnesses of the non-Markovian dynamics of the system,so that our results may solve outstanding problems in the realization of faithful quantum teleportation over a long time.
