Maximal multi-photon entangled states,known as NOON states,play an essential role in quantum metrology.With the number of photons growing,NOON states are becoming increasingly powerful and advantageous for obtaining s...Maximal multi-photon entangled states,known as NOON states,play an essential role in quantum metrology.With the number of photons growing,NOON states are becoming increasingly powerful and advantageous for obtaining supersensitive and super-resolved measurements.In this paper,we propose a universal scheme for generating three-and four-photon path-entangled NOON states on a reconfigurable photonic chip via photons subtracted from pairs and detected by heralding counters.Our method is postselection free,enabling phase supersensitive measurements and sensing at the Heisenberg limit.Our NOON-state generator allows for integration of quantum light sources as well as practical and portable precision phase-related measurements.展开更多
In the first half of the 20th century, a great number of modernism literary works emerged. Katherine Ann Porter,a famous short story writer and stylist, has positive thoughts and keen insights, and her unique artistic...In the first half of the 20th century, a great number of modernism literary works emerged. Katherine Ann Porter,a famous short story writer and stylist, has positive thoughts and keen insights, and her unique artistic features inher works are innovative and attractive. Her works also have a good reputation both at home and abroad. This paperselects Porter’s famous collection Pale Horse, Pale Rider including Old Morality and Noon Wine to analyze andexplore their narrative technique.展开更多
We put forward two efficient entanglement concentration protocols(ECPs) for arbitrary less-entangled NOON state.Both ECPs only require one pair of less-entangled NOON state and an auxiliary photon.In the first ECP,the...We put forward two efficient entanglement concentration protocols(ECPs) for arbitrary less-entangled NOON state.Both ECPs only require one pair of less-entangled NOON state and an auxiliary photon.In the first ECP,the auxiliary photon is shared by two parties,while in the second ECP,the auxiliary photon is only possessed by one party,which can increase the practical success probability by avoiding the transmission loss and simplify the operations.Moreover,both ECPs can be used repeatedly to get a high success probability.Based on the above features,our two ECPs,especially the second one,may be useful in the quantum information processing.展开更多
The model of double-well Bose-Einstein condensates in the strong-interaction regime is shown to reduceadiabatically to an effective two-state model describing the Rabi oscillations between the two atomic Fock states |...The model of double-well Bose-Einstein condensates in the strong-interaction regime is shown to reduceadiabatically to an effective two-state model describing the Rabi oscillations between the two atomic Fock states |N,0〉and |0,N〉,and the NOON states of arbitrary ultracold atoms can therefore be generated periodically from the initialstate of either one of the Fock states.展开更多
We propose a scheme to realize two-parameter estimation via Bose–Einstein condensates confined in a symmetric triple-well potential.The three-mode NOON state is prepared adiabatically as the initial state.The two par...We propose a scheme to realize two-parameter estimation via Bose–Einstein condensates confined in a symmetric triple-well potential.The three-mode NOON state is prepared adiabatically as the initial state.The two parameters to be estimated are the phase differences between the wells.The sensitivity of this estimation scheme is studied by comparing quantum and classical Fisher information matrices.As a result,we find an optimal particle number measurement method.Moreover,the precision of this estimation scheme means that the Heisenberg scaling behaves under the optimal measurement.展开更多
We present an efficient scheme for the generation of NOON states of photons in circuit QED assisted by a superconducting charge qutrit.It is completed with two kinds of manipulations,that is,the resonant operation on ...We present an efficient scheme for the generation of NOON states of photons in circuit QED assisted by a superconducting charge qutrit.It is completed with two kinds of manipulations,that is,the resonant operation on the qutrit and the resonator,and the single-qubit operation on the qutrit,and they both are high-fidelity operations.Compared with the one by a superconducting transmon qutrit proposed by Su et al.(Sci Rep 4:3898,2014),our scheme does not require to maintain the qutrit in the third excited state with a long time,which relaxes the difficulty of its implementation in experiment.Moreover,the level anharmonicity of a charge qutrit is larger and it is better for us to tune the different transitions of the charge qutrit resonant to the resonator,which makes our scheme faster than others.展开更多
基金supported by the National Basic Research Program of China(Grant No.2017YFA0303700)the Open Funds from the State Key Laboratory of High Performance Computing of China(HPCL,National University of Defense Technology)。
文摘Maximal multi-photon entangled states,known as NOON states,play an essential role in quantum metrology.With the number of photons growing,NOON states are becoming increasingly powerful and advantageous for obtaining supersensitive and super-resolved measurements.In this paper,we propose a universal scheme for generating three-and four-photon path-entangled NOON states on a reconfigurable photonic chip via photons subtracted from pairs and detected by heralding counters.Our method is postselection free,enabling phase supersensitive measurements and sensing at the Heisenberg limit.Our NOON-state generator allows for integration of quantum light sources as well as practical and portable precision phase-related measurements.
文摘In the first half of the 20th century, a great number of modernism literary works emerged. Katherine Ann Porter,a famous short story writer and stylist, has positive thoughts and keen insights, and her unique artistic features inher works are innovative and attractive. Her works also have a good reputation both at home and abroad. This paperselects Porter’s famous collection Pale Horse, Pale Rider including Old Morality and Noon Wine to analyze andexplore their narrative technique.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11474168 and 61401222)the Qing Lan Project of Jiangsu Province of China+1 种基金the Natural Science Foundation of Jiangsu Province of China(Grant No.BK20151502)the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘We put forward two efficient entanglement concentration protocols(ECPs) for arbitrary less-entangled NOON state.Both ECPs only require one pair of less-entangled NOON state and an auxiliary photon.In the first ECP,the auxiliary photon is shared by two parties,while in the second ECP,the auxiliary photon is only possessed by one party,which can increase the practical success probability by avoiding the transmission loss and simplify the operations.Moreover,both ECPs can be used repeatedly to get a high success probability.Based on the above features,our two ECPs,especially the second one,may be useful in the quantum information processing.
基金Supported in part by the National Natural Science Foundation of China under Grant Nos.60478029,10575040,10634060,and 90503010the National Fundamental Research Program of China under Grant No.2005CB724508
文摘The model of double-well Bose-Einstein condensates in the strong-interaction regime is shown to reduceadiabatically to an effective two-state model describing the Rabi oscillations between the two atomic Fock states |N,0〉and |0,N〉,and the NOON states of arbitrary ultracold atoms can therefore be generated periodically from the initialstate of either one of the Fock states.
基金supported by the National Natural Science Foundation of China(NSFC)(Grant Nos.12088101,11725417,and U1930403)Science Challenge Project(Grant No.TZ2018005)。
文摘We propose a scheme to realize two-parameter estimation via Bose–Einstein condensates confined in a symmetric triple-well potential.The three-mode NOON state is prepared adiabatically as the initial state.The two parameters to be estimated are the phase differences between the wells.The sensitivity of this estimation scheme is studied by comparing quantum and classical Fisher information matrices.As a result,we find an optimal particle number measurement method.Moreover,the precision of this estimation scheme means that the Heisenberg scaling behaves under the optimal measurement.
基金supported by the National Natural Science Foundation of China (11174039)NECT-11-0031
文摘We present an efficient scheme for the generation of NOON states of photons in circuit QED assisted by a superconducting charge qutrit.It is completed with two kinds of manipulations,that is,the resonant operation on the qutrit and the resonator,and the single-qubit operation on the qutrit,and they both are high-fidelity operations.Compared with the one by a superconducting transmon qutrit proposed by Su et al.(Sci Rep 4:3898,2014),our scheme does not require to maintain the qutrit in the third excited state with a long time,which relaxes the difficulty of its implementation in experiment.Moreover,the level anharmonicity of a charge qutrit is larger and it is better for us to tune the different transitions of the charge qutrit resonant to the resonator,which makes our scheme faster than others.
