Can the polygraph test be made more accurate ? Has anyone made a polygraph machine or any kind of machine that can detect whether a person is lying or not ?

In movies it is shown that through polygraph test it can be found whether a person is lying or not. But we all know that it is not correct. What I am asking can the polygraph test be modified, more data collected so that it becomes more accurate ? Also is there any alternative to polygraph machine to find whether a person is lying ?