the development of quantum computers primarily focuses on utilizing quantum mechanical systems such as qubits to perform computations. These qubits can be implemented using various physical systems, including superconducting circuits, trapped ions, topological states, and more.
While liquid and gas are states of matter that can exhibit quantum behavior, building a practical and scalable quantum computer solely out of liquid or gas is highly challenging. The main reason is that such states typically involve a large number of particles with complex interactions, making it difficult to achieve the precise control and isolation required for quantum computations.
Currently, the most promising physical implementations of quantum computers involve solid-state and atomic systems, which provide better controllability and coherence for qubits. These systems allow for the precise manipulation and measurement of individual quantum states required for quantum computations.
That being said, research in the field of quantum computing is rapidly evolving, and new approaches and technologies may emerge in the future. It's always possible that advancements in understanding and controlling liquid or gas systems could lead to novel ways of building quantum computers. However, at present, the predominant focus is on other physical implementations that offer better prospects for achieving large-scale, fault-tolerant quantum computation.