is quantum computer really possible?

Creating a practical, large-scale quantum computer is an extremely challenging task. While it's theoretically possible to build a quantum computer, there are many obstacles to overcome. Here are some of the challenges:

1. **Quantum noise**: Quantum computers are prone to errors due to the noisy nature of quantum systems. This noise can cause errors to accumulate, making it difficult to maintain the fragile quantum states.

2. **Scalability**: As the number of qubits (quantum bits) increases, the complexity of the system grows exponentially. This makes it challenging to maintain control and coherence over the qubits.

3. **Quantum control**: Maintaining control over the quantum states requires precise control over the quantum systems, which is difficult to achieve, especially at the scale of thousands or millions of qubits.

4. **Error correction**: Developing robust error correction techniques is crucial for large-scale quantum computing. However, current methods are limited, and more research is needed to develop effective error correction strategies.

5. **Materials science**: Developing materials that can maintain quantum coherence for extended periods is a significant challenge. Currently, most quantum computing architectures rely on superconducting materials, which have limitations.

6. **Cooling and isolation**: Maintaining extremely low temperatures (near absolute zero) and isolating the quantum systems from the environment are essential. This requires sophisticated cryogenic systems and shielding.

7. **Quantum algorithms**: Developing practical quantum algorithms that can solve real-world problems efficiently is an active area of research. Currently, most quantum algorithms are still in the theoretical stage.

Despite these challenges, researchers and companies are actively working on developing practical quantum computers. Some notable examples include:

1. **IBM Quantum**: IBM has developed a 53-qubit quantum computer, which is available for cloud-based access.

2. **Google Quantum AI Lab**: Google has developed a 53-qubit quantum computer, which has achieved quantum supremacy (solving a specific problem faster than a classical computer).

3. **Rigetti Computing**: Rigetti has developed a 128-qubit quantum computer, which is available for cloud-based access.

4. **IonQ**: IonQ has developed a 32-qubit quantum computer, which is available for cloud-based access.

While we have made significant progress in quantum computing, we are still far from building a practical, large-scale quantum computer. However, the ongoing research and advancements in materials science, quantum control, and error correction will likely lead to significant breakthroughs in the near future. 

-- using groq with llama3