# Qubit Energy Level Required to be Unevenly Separated

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In summary, Quantum computers based on quantum harmonic oscillators require non-linear inductors to create unevenly spaced energy levels in order to form a qubit that can be set without making transitions to other energy levels.
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TL;DR Summary
Why does a Qubit need to have energy levels be unevenly separated?
I been reading up on quantum computers and in particular ones based on quantum harmonic oscillators. In all the articles, I have come across they mention a regular, linear LC oscillator cannot be used for a Qubit because it's energy levels are evenly spaced. Therefore, they use a non-linear inductor to create a non-linear LC oscillator which will have energy levels that are unevenly spaced. Can someone explain to me why unevenly spaced energy levels are required to create a quantum system/qubit?

You need two isolated levels to form a qubit. In a linear h.o., any interaction that allows you to set the qubit by making transitions between 0 and 1 will also make transitions between 1 and 2, and so on.

## 1. What is a qubit?

A qubit is the basic unit of quantum information in quantum computing. It is the quantum analog of the classical bit, and can represent a 0, 1, or a superposition of both states simultaneously.

## 2. Why is it important for qubit energy levels to be unevenly separated?

Unevenly separated energy levels in a qubit allow for more precise control and manipulation of the qubit's state. This is crucial for performing operations in quantum computing, as it allows for greater accuracy and reduces the likelihood of errors.

## 3. How are qubit energy levels separated?

Qubit energy levels are separated using external energy sources, such as magnetic fields or microwave pulses. These sources are used to manipulate the energy levels of the qubit, creating an uneven separation between the states.

## 4. What happens if the qubit energy levels are evenly separated?

If the qubit energy levels are evenly separated, it becomes more difficult to control and manipulate the qubit's state. This can lead to errors and inaccuracies in quantum computing operations.

## 5. Are there any limitations to unevenly separating qubit energy levels?

Yes, there are limitations to unevenly separating qubit energy levels. It requires precise control and can be affected by external factors, such as noise and interference. Additionally, not all qubits are able to have their energy levels evenly separated, which can limit the types of operations that can be performed.

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