Difference between Bits and Quantum Bits

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

A qubits (quantum bits) can hold a one, a zero or crucially a superposition of

these.

 

Qubits(Quantum bits) are use in quantum computer 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

 

Its circuit behaviour based on quantum mechanics.