Difference between Bits and Quantum Bits
Last Updated :
31 May, 2021
1. Bits :
It’s a single unit of information that has a value of either 0 or 1 (off or on, false or true, low or high).
2. Quantum Bits :
In quantum computing, a qubit or quantum bit is the basic unit of quantum information—the quantum version of the classical binary bit physically realized with a two-state device. A qubit is a two-state quantum-mechanical system, one of the simplest quantum systems displaying the peculiarity of quantum mechanics.
Difference between Bits and Qubits in Quantum Computing :
| S.NO |
BITS |
QUBITS |
| 1. |
The device computes by manipulating those bits with the help of logical gates (AND, OR, NOT). |
The device computes by manipulating those bits with the help of quantum logic gates. |
| 2. |
A classical computer has a memory made up of bits where each bit hold either a one or zero. |
A qubits (quantum bits) can hold a one, a zero or crucially a superposition of these. |
| 3. |
Bits are used in classical computers. |
Qubits(Quantum bits) are use in quantum computer |
| 4. |
Information is stored in bits, which take the discrete values 0 and 1. |
Information is stored in quantum bits, or qbits. A qbit can be in states labelled |0} and |1}, but it can also be in a superposition of these states, a|0} + b|1}, where a and b are complex numbers. If we think of the state of a qbit as a vector, then superposition of states is just vector addition. |
| 5. |
For example, if storing one number takes 64 bits, then storing N numbers takes N times 64 bits. |
For example, for every extra qbit you get, you can store twice as many numbers. For example, with 3 qbits, you get coefficients for |000}, |001}, |010}, |011}, |100}, |101}, |110} and |111}. |
| 6. |
Bits are slow. |
Qubits are faster. |
| 7. |
Its circuit behaviour based on classical physics. |
Its circuit behaviour based on quantum mechanics. |
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