Abstract: Disclosed are a method and an apparatus for constructing a quantum circuit corresponding to a linear function. The method includes: adding an independent variable of a target linear function on a first qubit; obtaining a second qubit for outputting the target linear function, adding a parametric quantum logic gate acting on the second qubit, and controlling the parametric quantum logic gate by using the first qubit; and determining a parameter value of the parametric quantum logic gate based on the target linear function, to obtain a quantum circuit corresponding to the target linear function.

Abstract: Disclosed are a method and an apparatus for constructing a quantum circuit corresponding to a linear function. The method includes: adding an independent variable of a target linear function on a first qubit; obtaining a second qubit for outputting the target linear function, adding a parametric quantum logic gate acting on the second qubit, and controlling the parametric quantum logic gate by using the first qubit; and determining a parameter value of the parametric quantum logic gate based on the target linear function, to obtain a quantum circuit corresponding to the target linear function.

Abstract: Disclosed is a quantum circuit-based value-at-risk estimation method, device, medium and electronic device, which represents correspondingly sampled value fluctuation ratios and fluctuation ratio probabilities based on the N target qubits, then builds a corresponding quantum circuit based on the target qubits, obtains every target probability whose value fluctuation ratio is less than a fluctuation ratio reference value through the quantum circuit, then determines the target value fluctuation ratio according to the target probability and the probability threshold, and finally calculates the target value-at-risk of the target object according to the target value fluctuation ratio.

Abstract: Disclosed are a method and an apparatus for amplitude estimation of a quantum circuit. The method includes: calculating a first difference value between a current angle upper limit value and a current angle lower limit value corresponding to a to-be-estimated amplitude of a target quantum state, and determining the first difference value as a target difference; determining, a next angle amplification factor and a next flag parameter corresponding to a next iteration step; amplifying the target quantum circuit by the next angle amplification factor; calculating a second difference value between a next angle upper limit value and a next angle lower limit value of the to-be-estimated amplitude, and determining the second difference value as a target difference; and determining, based on an angle upper limit value and an angle lower limit value that reach the precision threshold, a probability estimated value corresponding to a to-be-estimated quantum bit.

Abstract: Disclosed are a method and an apparatus for amplitude estimation of a quantum circuit. The method includes: calculating a first difference value between a current angle upper limit value and a current angle lower limit value corresponding to a to-be-estimated amplitude of a target quantum state, and determining the first difference value as a target difference; determining, a next angle amplification factor and a next flag parameter corresponding to a next iteration step; amplifying the target quantum circuit by the next angle amplification factor; calculating a second difference value between a next angle upper limit value and a next angle lower limit value of the to-be-estimated amplitude, and determining the second difference value as a target difference; and determining, based on an angle upper limit value and an angle lower limit value that reach the precision threshold, a probability estimated value corresponding to a to-be-estimated quantum bit.