1.位：
它是一个单一的信息单元，其值为0或1(关闭或打开，错误或正确，低或高)。
2.量子位：
在量子计算中，量子位或量子位是量子信息的基本单位，这是用二态设备物理实现的经典二进制位的量子形式。量子位是一个两态量子力学系统，是显示量子力学特殊性的最简单的量子系统之一。
量子计算中位与位的区别：
| 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. |