The invention discloses a multichannel
quantum state
feedback control method. The method comprises the following steps: S1, performing
quantum state measurement by using an entanglement collective measurement method; s2, analyzing the state of the obtained
quantum state information through a classical calculation method; s3, the processed information is fed back to the
quantum system, and the state of the
quantum system is adjusted; and S4, the state of the
quantum system is monitored in real time, so that
feedback control is adjusted in real time. According to the method, entanglement collective measurement is used, non-local measurement is carried out on
multiple quantum system copies at the same time, so that the measurement efficiency and precision are improved, and the standard quantum limit is exceeded. According to the method, needed quantum resources can be reduced, weak signals are enhanced, sensitive detection on tiny changes is achieved, damage to the
quantum state is reduced, in addition, entanglement collective measurement supports real-time
feedback control, the state of a quantum
system is allowed to be dynamically adjusted, and performance is optimized. And the problem of
precision balance in multi-parameter measurement can be solved, and simultaneous optimal measurement of multiple parameters can be realized.