Phase shifter, quantum logic gate device, optical quantum computing device and method for phase shifting

Abstract

The embodiment of the invention provides a phase shifter, a quantum logic gate device, an optical quantum computing device and a phase shifting method. The phase shifter includes an optical cavity and quantum dots, and the resonance frequency of the optical cavity is ω c , the quantum dots are located in the optical resonant cavity, and the transition frequency ω of the quantum dots x , the quantum dots and the optical resonator are coupled to obtain a coupled system, and the transition energy difference of the coupled system is given by ω c , ω x and the coupling strength g between the quantum dot and the optical cavity, ω x It is set such that the transition energy difference of the coupling system is the same as the energy of a photon or two photons input to the coupling system. The embodiment of the present invention can realize the phase inversion of the quantum state by adjusting the transition frequency of the quantum dot.

Description

technical field [0001] Embodiments of the present invention relate to the field of quantum computing, and more specifically, relate to a phase shifter, a quantum logic gate device, an optical quantum computing device, and a phase shifting method. Background technique [0002] A quantum computer is a device that uses the principles of quantum mechanics to perform general-purpose computing. Classical computers encode, store, and process data in binary using 0s and 1s, with each bit taking the value of 0 or 1. Quantum computing is based on the manipulation of qubits (Qubit, QB), and each qubit can be in a quantum state |0> qb state and |1> qb superposition of states. This makes quantum computers have powerful quantum parallel computing capabilities. [0003] Optical quantum computing and quantum information processing use single photons as qubit carriers. Using single photon as a qubit carrier has the following advantages: 1. The noise level of the single photon syst...

AI Technical Summary

Problems solved by technology

Existing optical nonlinear materials are difficult to meet the extremely strong optical nonlinearity required by the interaction between single photons to achieve phase inversion

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