Input and Output with a Quantum Computer etc

[jaketodd]

What physical processes input information into and extract information out of a quantum computer? What I really want to know is: How do you get a qubit or quantum dot to take on a particular state and cause its' entangled partner to choose a state?

Thank you!

 

[f95toli]

It depends on the system. In general you need a "knob" that you can use to move the state of the system around on the Bloch sphere.
In most systems this is done using resonant pulses of some sort, usually (in e.g. NMR and solid state computing) this means applying short microwave pulses to the system.

 

[Entropia]

I can provide a response to your question about input and output in quantum computers. In order to understand the processes involved, it is important to first understand the basic principles of quantum computing.

Quantum computers use qubits, which are the fundamental units of information in quantum computing. Unlike classical computers, which use bits that can only be in a state of 0 or 1, qubits can exist in a superposition of both states at the same time. This allows for exponentially more computational power and makes quantum computers ideal for solving complex problems.

In order for a qubit to take on a particular state, it must undergo a process called quantum state preparation. This involves manipulating the quantum state of the qubit using techniques such as laser pulses or magnetic fields. The specific method used will depend on the type of qubit being used, as there are several different physical systems that can be used to create qubits, such as superconducting circuits, trapped ions, or quantum dots.

Once the qubit is in the desired state, it can interact with other qubits through a process called quantum entanglement. This is when two or more qubits become correlated in such a way that the state of one qubit is dependent on the state of the other qubit. This allows for the creation of entangled pairs of qubits, where the state of one qubit can be used to determine the state of its entangled partner.

To extract information from a quantum computer, the qubits must undergo a process called quantum measurement. This involves reading the state of the qubits, which can be done through various methods such as using photons to interact with the qubit or measuring the electrical charge of the qubit. The result of the measurement will then be used to determine the output of the quantum computation.

In summary, input and output in quantum computing involve manipulating the quantum state of qubits through processes such as quantum state preparation and quantum measurement. Quantum entanglement also plays a crucial role in allowing for the interaction between qubits and the extraction of information from the quantum computer. I hope this helps to answer your question.