We demonstrate high-fidelity manipulation of the quantized motion of a single87Rb atom in an optical tweezer via microwave couplings induced by Stern–Gerlach splitting. The Stern–Gerlach splitting is mediated by pol...We demonstrate high-fidelity manipulation of the quantized motion of a single87Rb atom in an optical tweezer via microwave couplings induced by Stern–Gerlach splitting. The Stern–Gerlach splitting is mediated by polarization gradient of a strongly focused tweezer beam that functions as fictitious magnetic field gradient. The spatial splitting removes the orthogonality of the atomic spatial wavefunctions, thus enables the microwave couplings between the motional states. We obtain coherent Rabi oscillations for up to third-order sideband transitions, in which a high fidelity of larger than 0.99 is obtained for the spin-flip transition on the first order sideband after subtraction of the state preparation and detection error. The Stern–Gerlach splitting is measured at a precision of better than 0.05 nm. This work paves the way for quantum engineering of motional states of single atoms, and may have wide applications in few body physics and ultracold chemistry.展开更多
We propose a space-borne gravitational-wave detection scheme,called atom interferometric gravitationalwave space observatory(AIGSO).It is motivated by the progress in the atomic matter-wave interferometry,which solely...We propose a space-borne gravitational-wave detection scheme,called atom interferometric gravitationalwave space observatory(AIGSO).It is motivated by the progress in the atomic matter-wave interferometry,which solely utilizes the standing light waves to split,deflect and recombine the atomic beam.Our scheme consists of three drag-free satellites orbiting the Earth.The phase shift of AIGSO is dominated by the Sagnac effect of gravitational-waves,which is proportional to the area enclosed by the a√tom interferometer,the frequency and amplitude of gravitational-waves.The scheme has a strain sensitivity<10^(-20)/Hz^(1/2)in the 100 mHz–10 Hz frequency range,which fills in the detection gap between space-based and ground-based laser interferometric detectors.Thus,our proposed AIGSO can be a good complementary detection scheme to the space-borne laser interferometric schemes,such as LISA.Considering the current status of relevant technology readiness,we expect our AIGSO to be a promising candidate for the future space-based gravitational-wave detection plan.展开更多
Recently, a configuration using atomic interferometers （AIs） had been sug- gested for the detection of gravitational waves. A new AI with some additional laser pulses for implementing large momentum transfer was als...Recently, a configuration using atomic interferometers （AIs） had been sug- gested for the detection of gravitational waves. A new AI with some additional laser pulses for implementing large momentum transfer was also put forward, in order to reduce the effect of shot noise and laser frequency noise. We use a sensitivity function to analyze all possible configurations of the new AI and to distinguish how many mo- menta are transferred in a specific configuration. By analyzing the new configuration, we further explore a detection scheme for gravitational waves, in particular, that ame- liorates laser frequency noise. We find that the amelioration occurs in such a scheme, but novelly, in some cases, the frequency noise can be canceled completely by using a proper data processing method.展开更多
We propose and demonstrate an alternative method for spectral filtering and frequency stabilization of both 780-nm and 960-nm lasers using a high-finesse length-tunable cavity(HFLTC).Firstly,the length of HFLTC is sta...We propose and demonstrate an alternative method for spectral filtering and frequency stabilization of both 780-nm and 960-nm lasers using a high-finesse length-tunable cavity(HFLTC).Firstly,the length of HFLTC is stabilized to a commercial frequency reference.Then,the two lasers are locked to this HFLTC using the Pound–Drever–Hall(PDH)method which can narrow the linewidths and stabilize the frequencies of both lasers simultaneously.Finally,the transmitted lasers of HFLTC with each power up to about 100μW,which act as seed lasers,are amplified using the injection locking method for single-atom Rydberg excitation.The linewidths of obtained lasers are narrowed to be less than 1 k Hz,meanwhile the obtained lasers'phase noise around 750 k Hz are suppressed about 30 d B.With the spectrally filtered lasers,we demonstrate a Rabi oscillation between the ground state and Rydberg state of single-atoms in an optical trap tweezer with a decay time of(67±37)μs,which is almost not affected by laser phase noise.We found that the maximum short-term laser frequency fluctuation of a single excitation lasers is at~3.3 k Hz and the maximum long-term laser frequency drift of a single laser is~46 k Hz during one month.Our work develops a stable and repeatable method to provide multiple laser sources of ultra-low phase noise,narrow linewidth,and excellent frequency stability,which is essential for high precision atomic experiments,such as neutral atom quantum computing,quantum simulation,quantum metrology,and so on.展开更多
Coriolis effect is an important error source in the weak equivalence principle(WEP)test using atom interferometer.In this paper,the problem of Coriolis error in WEP test is studied theoretically and experimentally.In ...Coriolis effect is an important error source in the weak equivalence principle(WEP)test using atom interferometer.In this paper,the problem of Coriolis error in WEP test is studied theoretically and experimentally.In theoretical simulation,the Coriolis effect is analyzed by establishing an error model.The measurement errors of Eotvos coefficient(η)in WEP test related to experimental parameters,such as horizontal-velocity difference and horizontal-position difference of atomic clouds,horizontal-position difference of detectors,and rotation compensation of Raman laser’s mirror are calculated.In experimental investigation,the position difference between^85Rb and^87Rb atomic clouds is reduced to 0.1 mm by optimizing the experimental parameters,an alternating detection method is used to suppress the error caused by detection position difference,thus the Coriolis error related to the atomic clouds and detectors is reduced to 1.1 × 10^-9.This Coriolis error is further corrected by com pensating the rotation of Raman laser's mirror,and the total uncertainty o f rj measurement related to the Coriolis effect is reduced as δη=4.4 × 10^-11.展开更多
基金Supported by the National Key Research and Development Program of China(Grant Nos.2017YFA0304501,2016YFA0302800 and 2016YFA0302002)the Key Research Program of Frontier Science of the Chinese Academy of Sciences(CAS)(Grant No.ZDBS-LY-SLH012)+2 种基金the National Natural Science Foundation of China(Grant No.11774389)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB21010100)the Youth Innovation Promotion Association CAS(Grant No.2019325).
文摘We demonstrate high-fidelity manipulation of the quantized motion of a single87Rb atom in an optical tweezer via microwave couplings induced by Stern–Gerlach splitting. The Stern–Gerlach splitting is mediated by polarization gradient of a strongly focused tweezer beam that functions as fictitious magnetic field gradient. The spatial splitting removes the orthogonality of the atomic spatial wavefunctions, thus enables the microwave couplings between the motional states. We obtain coherent Rabi oscillations for up to third-order sideband transitions, in which a high fidelity of larger than 0.99 is obtained for the spin-flip transition on the first order sideband after subtraction of the state preparation and detection error. The Stern–Gerlach splitting is measured at a precision of better than 0.05 nm. This work paves the way for quantum engineering of motional states of single atoms, and may have wide applications in few body physics and ultracold chemistry.
基金Supported by the National Key Research Program of China under Grant No.2016YFA0302002the National Science Foundation of China under Grant Nos.11227803 and 91536221the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant No.XDB21010100
文摘We propose a space-borne gravitational-wave detection scheme,called atom interferometric gravitationalwave space observatory(AIGSO).It is motivated by the progress in the atomic matter-wave interferometry,which solely utilizes the standing light waves to split,deflect and recombine the atomic beam.Our scheme consists of three drag-free satellites orbiting the Earth.The phase shift of AIGSO is dominated by the Sagnac effect of gravitational-waves,which is proportional to the area enclosed by the a√tom interferometer,the frequency and amplitude of gravitational-waves.The scheme has a strain sensitivity<10^(-20)/Hz^(1/2)in the 100 mHz–10 Hz frequency range,which fills in the detection gap between space-based and ground-based laser interferometric detectors.Thus,our proposed AIGSO can be a good complementary detection scheme to the space-borne laser interferometric schemes,such as LISA.Considering the current status of relevant technology readiness,we expect our AIGSO to be a promising candidate for the future space-based gravitational-wave detection plan.
基金Supported by the National Natural Science Foundation of China
文摘Recently, a configuration using atomic interferometers （AIs） had been sug- gested for the detection of gravitational waves. A new AI with some additional laser pulses for implementing large momentum transfer was also put forward, in order to reduce the effect of shot noise and laser frequency noise. We use a sensitivity function to analyze all possible configurations of the new AI and to distinguish how many mo- menta are transferred in a specific configuration. By analyzing the new configuration, we further explore a detection scheme for gravitational waves, in particular, that ame- liorates laser frequency noise. We find that the amelioration occurs in such a scheme, but novelly, in some cases, the frequency noise can be canceled completely by using a proper data processing method.
基金National Key Research and Development Program of China(Grant No.2016YFA0302800)the National Natural Science Foundation of China(Grant Nos.U20A2074 and 12074391)+2 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB 21010100)the Youth Innovation Promotion Association of Chinese Academy of Sciences(Grant No.2017378)K.C.Wong Education Foundation(Grant No.GJTD-2019-15)。
文摘We propose and demonstrate an alternative method for spectral filtering and frequency stabilization of both 780-nm and 960-nm lasers using a high-finesse length-tunable cavity(HFLTC).Firstly,the length of HFLTC is stabilized to a commercial frequency reference.Then,the two lasers are locked to this HFLTC using the Pound–Drever–Hall(PDH)method which can narrow the linewidths and stabilize the frequencies of both lasers simultaneously.Finally,the transmitted lasers of HFLTC with each power up to about 100μW,which act as seed lasers,are amplified using the injection locking method for single-atom Rydberg excitation.The linewidths of obtained lasers are narrowed to be less than 1 k Hz,meanwhile the obtained lasers'phase noise around 750 k Hz are suppressed about 30 d B.With the spectrally filtered lasers,we demonstrate a Rabi oscillation between the ground state and Rydberg state of single-atoms in an optical trap tweezer with a decay time of(67±37)μs,which is almost not affected by laser phase noise.We found that the maximum short-term laser frequency fluctuation of a single excitation lasers is at~3.3 k Hz and the maximum long-term laser frequency drift of a single laser is~46 k Hz during one month.Our work develops a stable and repeatable method to provide multiple laser sources of ultra-low phase noise,narrow linewidth,and excellent frequency stability,which is essential for high precision atomic experiments,such as neutral atom quantum computing,quantum simulation,quantum metrology,and so on.
基金Project supported by the National Key Research and Development Program of China(Grant No.2016YFA0302002)the National Natural Science Foundation of China(Grant Nos.91736311 and 11574354)+1 种基金Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB21010100)the Youth Innovation Promotion Association of the Chinese Academy of Sciences(Grant No.2016300).
文摘Coriolis effect is an important error source in the weak equivalence principle(WEP)test using atom interferometer.In this paper,the problem of Coriolis error in WEP test is studied theoretically and experimentally.In theoretical simulation,the Coriolis effect is analyzed by establishing an error model.The measurement errors of Eotvos coefficient(η)in WEP test related to experimental parameters,such as horizontal-velocity difference and horizontal-position difference of atomic clouds,horizontal-position difference of detectors,and rotation compensation of Raman laser’s mirror are calculated.In experimental investigation,the position difference between^85Rb and^87Rb atomic clouds is reduced to 0.1 mm by optimizing the experimental parameters,an alternating detection method is used to suppress the error caused by detection position difference,thus the Coriolis error related to the atomic clouds and detectors is reduced to 1.1 × 10^-9.This Coriolis error is further corrected by com pensating the rotation of Raman laser's mirror,and the total uncertainty o f rj measurement related to the Coriolis effect is reduced as δη=4.4 × 10^-11.
