Abstract
In this paper, the squeezed quantum state is generated using an optical parametric oscillator via a spontaneous parametric down conversion technique to investigate squeezed states with quantum noise in one quadrature below the standard quantum limit at the expense of the other. The setup involves four main parts: generation of Nd-YAG second harmonic via a ring resonator, squeezed cavity with a nonlinear crystal inside to generate the squeezed state, Pound-Drever-Hall technique to stabilize the laser in the squeezed cavity and balanced homodyne receiver with high efficiency to detect the squeezed state. A comparison in error probability is addressed between the quantum coherent classical and the quantum squeezed non-classical state in the presence of thermal noise and the dissipation. It is found that with extremely low number of photons, the squeezed state is robust against channel noise.
Highlights
This section simulates the generation of squeezed state and its application in binary quantum communication
Binary phase shift keying (PSK) digital modulation is usually used in binary quantum communication in order to modulate the quantum states So two coherent states and are encoded in 0 and 1, respectively, transmitted through a noisy channel
Investigating this figure reveals that the error probability for both squeezed and coherent states has the same value when G=0
Summary
This section simulates the generation of squeezed state and its application in binary quantum communication. The error probability is theoretically computed and compared with the error probability of the simulation results. The simulation work is based on MATLAB R2012a, MATHCAD 15, KaleidaGraph, and LABVIEW. The program involves three parts: transmitter, channel, and receiver. The sender generates randomly two real coherent states and , encoded in two digits 0 and 1, respectively, and transmits the state to the receiver through a noisy channel with the following parameters at time
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