How are quantum bits implememted?

In summary, there are various methods for representing qubits from a hardware perspective, including logic gates or transistor circuits, and physical implementations such as those discussed in the Wikipedia article and the IBM quantum computing web interface. However, it can be difficult to find visual representations of these systems.
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JohnsonJohnson
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Its very easy to pull a logic gate or transistor circuit of the internet for example and begin to understand how it represents physical bits, by either having 5V across the circuit or below 3.3V. But I was wondering what are some of the methods for representing qubits from a hardware perspective.

I have already looked on Wikipedia and find the explanation to be very abstract and vague.

Thanks
 
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  • #2
This wiki article has a table of implementations halfway into the article:

https://en.wikipedia.org/wiki/Qubit

see the Physical Representation section.

Here's a discussion of the IBM quantum computing web interface:

https://solutiondesign.com/blog/-/blogs/quantum-computing

I couldn't find a pictorial article on the various qubit systems though.

I found this powerpoint discussion which talks about one such system and superposition:

http://www.slideshare.net/rushmila/quantum-computing-introduction?next_slideshow=1
 
Last edited:

1. What is a quantum bit (qubit)?

A quantum bit, or qubit, is the basic unit of quantum information. Unlike classical bits, which can only exist in a state of 0 or 1, qubits can exist in a state of 0, 1, or a superposition of both states simultaneously.

2. How are qubits physically implemented?

Qubits can be implemented using a variety of physical systems, such as photons, ions, superconductors, and quantum dots. These systems are manipulated using techniques such as laser pulses, magnetic fields, and electrical currents.

3. What is entanglement and how is it used in qubits?

Entanglement is a phenomenon in which two or more qubits become correlated in such a way that the state of one qubit can affect the state of the other, even if they are physically separated. This property is used in quantum computing to perform operations on multiple qubits simultaneously.

4. How does quantum error correction work?

Quantum error correction is a set of techniques used to protect qubits from errors caused by noise and other disturbances. This is achieved by encoding the information in multiple qubits and using error-correcting codes to detect and correct any errors that may occur during computation.

5. What are some current challenges in implementing quantum bits?

One of the biggest challenges in implementing quantum bits is maintaining their fragile quantum state. Even small interactions with the environment can cause qubits to lose their superposition and entanglement, leading to errors in computation. Other challenges include scaling up the number of qubits and improving the accuracy and reliability of operations.

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