Future inter-satellite clock comparison on high orbit will require optical time and frequency transmission technology between moving objects.Here,we demonstrate robust optical frequency transmission under the conditio...Future inter-satellite clock comparison on high orbit will require optical time and frequency transmission technology between moving objects.Here,we demonstrate robust optical frequency transmission under the condition of variable link distance.This variable link is accomplished by the relative motion of a single telescope fixed on the experimental platform to a corner-cube reflector(CCR)installed on a sliding guide.Two acousto–optic modulators with different frequencies are used to separate forward signal from backward signal.With active phase noise suppression,when the CCR moves back and forth at a constant velocity of 20 cm/s and an acceleration of 20 cm/s^(2),we achieve the best frequency stability of 1.9×10^(-16) at 1 s and 7.9×10^(-19) at 1000 s indoors.This work paves the way for future studying optical frequency transfer between ultra-high-orbit satellites.展开更多
Quantum beats can be produced in fourth-order interference such as in a Hong–Ou–Mandel(HOM) interferometer by using photons with different frequencies.Here we present theoretically the appearance of interference of ...Quantum beats can be produced in fourth-order interference such as in a Hong–Ou–Mandel(HOM) interferometer by using photons with different frequencies.Here we present theoretically the appearance of interference of quantum beats when the HOM interferometer is combined with a Franson-type interferometer.This combination can make the interference effect of photons with different colors take place not only within the coherence time of downconverted fields but also in the region beyond that.We expect that it can provide a new method in quantum metrology,as it can realize the measurement of time intervals in three scales.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant No.2020YFB0408300)the National Natural Science Foundation of China(Grant No.62175246)+2 种基金the Natural Science Foundation of Shanghai,China(Grant No.22ZR1471100)the Youth Innovation Promotion Association of Chinese Academy of Sciences(Grant No.YIPA2021244)the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0300701).
文摘Future inter-satellite clock comparison on high orbit will require optical time and frequency transmission technology between moving objects.Here,we demonstrate robust optical frequency transmission under the condition of variable link distance.This variable link is accomplished by the relative motion of a single telescope fixed on the experimental platform to a corner-cube reflector(CCR)installed on a sliding guide.Two acousto–optic modulators with different frequencies are used to separate forward signal from backward signal.With active phase noise suppression,when the CCR moves back and forth at a constant velocity of 20 cm/s and an acceleration of 20 cm/s^(2),we achieve the best frequency stability of 1.9×10^(-16) at 1 s and 7.9×10^(-19) at 1000 s indoors.This work paves the way for future studying optical frequency transfer between ultra-high-orbit satellites.
基金funded by the National Natural Science Foundation of China (Grant Nos.10974192 and 61275122)
文摘Quantum beats can be produced in fourth-order interference such as in a Hong–Ou–Mandel(HOM) interferometer by using photons with different frequencies.Here we present theoretically the appearance of interference of quantum beats when the HOM interferometer is combined with a Franson-type interferometer.This combination can make the interference effect of photons with different colors take place not only within the coherence time of downconverted fields but also in the region beyond that.We expect that it can provide a new method in quantum metrology,as it can realize the measurement of time intervals in three scales.
