Classicalization of quantum state of detector by amplification process

Publication date: Available online 1 March 2019Source: Physics Letters AAuthor(s): Arash Tirandaz, Farhad Taher Ghahramani, Ali Asadian, Mehdi GolshaniAbstractIt has been shown that a macroscopic system being in a high-temperature thermal coherent state can be, in principle, driven into a non-classical state by coupling to a microscopic system. Therefore, thermal coherent states do not truly represent the classical limit of quantum description. Here, we study the classical limit of quantum state of a more relevant macroscopic system, namely the pointer of a detector, after the phase-preserving linear amplification process. In particular, we examine to what extent it is possible to find the corresponding amplified state in a superposition state, by coupling the pointer to a qubit system. We demonstrate quantitatively that the amplification process is able to produce the classical limit of quantum state of the pointer, offering a route for a classical state in a sense of not to be projected into a quantum superposition state.
Source: Physics Letters A - Category: Physics Source Type: research

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