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Qubit vs. Bit — What's the Difference?

Difference Between Qubit and Bit

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Definitions

Qubit

In quantum computing, a qubit () or quantum bit is a basic unit of quantum information—the quantum version of the classic binary bit physically realized with a two-state device. A qubit is a two-state (or two-level) quantum-mechanical system, one of the simplest quantum systems displaying the peculiarity of quantum mechanics.

Bit

The bit is the most basic unit of information in computing and digital communications. The name is a contraction of binary digit.

Qubit

See quantum bit.

Bit

A small piece, part, or quantity of something
He read bits of his work to me
Give the duck a bit of bread

Qubit

(quantum computing) A quantum bit; the basic unit of quantum information described by a superposition of two states; a quantum bit in a quantum computer capable of being in a state of superposition.
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Bit

A set of actions or ideas associated with a specific group or activity
Miranda could go off and do her theatrical bit

Bit

A girl or young woman
He went and married some young bit half his age

Bit

A person's genitals
You could see everything! All her bits!

Bit

A unit of 12 1/2 cents (used only in even multiples).

Bit

A mouthpiece, typically made of metal, which is attached to a bridle and used to control a horse.
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Bit

A tool or piece for boring or drilling
A drill bit

Bit

A unit of information expressed as either a 0 or 1 in binary notation.

Bit

Put a bit into the mouth of (a horse).

Bit

A small portion, degree, or amount
A bit of lint.
A bit of luck.

Bit

A brief amount of time; a moment
Wait a bit.

Bit

A short scene or episode in a theatrical performance.

Bit

A bit part.

Bit

An entertainment routine given regularly by a performer; an act.

Bit

A particular kind of action, situation, or behavior
Got tired of the macho bit.

Bit

A matter being considered
What's this bit about inflation?.

Bit

(Informal) An amount equal to one eighth of a dollar
Two bits.

Bit

Chiefly British A small coin
A threepenny bit.

Bit

The sharp part of a tool, such as the cutting edge of a knife or axe.

Bit

A pointed and threaded tool for drilling and boring that is secured in a brace, bitstock, or drill press.

Bit

The part of a key that enters the lock and engages the bolt and tumblers.

Bit

The tip of the mouthpiece on a pipe or a cigarette or cigar holder.

Bit

The metal mouthpiece of a bridle, serving to control, curb, and direct an animal.

Bit

Something that controls, guides, or curbs.

Bit

A binary digit, having either the value 0 or 1, used to store or represent data.

Bit

To place a bit in the mouth of (a horse, for example).

Bit

To check or control with or as if with a bit.

Bit

To make or grind a bit on (a key).

Bit

Past tense and a past participle of bite.

Bit

A piece of metal placed in a horse's mouth and connected to the reins to direct the animal.
A horse hates having a bit put in its mouth.

Bit

A rotary cutting tool fitted to a drill, used to bore holes.

Bit

A coin of a specified value.
A threepenny bit

Bit

A ten-cent piece, dime.

Bit

A unit of currency or coin in the Americas worth a fraction of a Spanish dollar; now specifically, an eighth of a US dollar.
A quarter is two bits.

Bit

In the southern and southwestern states, a small silver coin (such as the real) formerly current; commonly, one worth about 12½ cents; also, the sum of 12½ cents.

Bit

A small amount of something.
There were bits of paper all over the floor.
Does your leg still hurt? —Just a bit now.
I've done my bit; I expect you to do yours.

Bit

(informal) Specifically, a small amount of time.
I'll be there in a bit; I need to take care of something first.
He was here just a bit ago, but it looks like he's stepped out.

Bit

Fractions of a second.
The 400 metres race was won in 47 seconds and bits.

Bit

A portion of something.
I'd like a big bit of cake, please.

Bit

Somewhat; something, but not very great; also used like jot and whit to express the smallest degree. See also a bit.
Am I bored? Not a bit of it!

Bit

(slang) A prison sentence, especially a short one.

Bit

An excerpt of material making up part of a show, comedy routine, etc.
His bit about video games was not nearly as entertaining as the other segments of his show.

Bit

The part of a key which enters the lock and acts upon the bolt and tumblers.

Bit

The cutting iron of a plane.

Bit

The bevelled front edge of an axehead along which the cutting edge runs.

Bit

(BDSM) A gag of a style similar to a bridle.

Bit

(MLE) A gun.

Bit

A binary digit, generally represented as a 1 or 0.

Bit

(computing) The smallest unit of storage in a digital computer, consisting of a binary digit.

Bit

Any datum that may take on one of exactly two values.
Status bits on IRC
Permission bits in a file system

Bit

(information theory) A unit of measure for information entropy.

Bit

A microbitcoin, or a millionth of a bitcoin (0.000001 BTC).

Bit

(transitive) To put a bridle upon; to put the bit in the mouth of (a horse).

Bit

Inflection of bite, bitten
I have been bit by your dog!

Bit

Having been bitten.
Even though he's bit, of course the zombies would still chase him.

Bit

The part of a bridle, usually of iron, which is inserted in the mouth of a horse, and having appendages to which the reins are fastened.
The foamy bridle with the bit of gold.

Bit

Fig.: Anything which curbs or restrains.

Bit

In the British West Indies, a fourpenny piece, or groat.

Bit

A part of anything, such as may be bitten off or taken into the mouth; a morsel; a bite. Hence: A small piece of anything; a little; a mite.

Bit

Somewhat; something, but not very great.
My young companion was a bit of a poet.

Bit

A tool for boring, of various forms and sizes, usually turned by means of a brace or bitstock. See Bitstock.

Bit

The part of a key which enters the lock and acts upon the bolt and tumblers.

Bit

The cutting iron of a plane.

Bit

In the Southern and Southwestern States, a small silver coin (as the real) formerly current; commonly, one worth about 12 1/2 cents; also, the sum of 12 1/2 cents.

Bit

To put a bridle upon; to put the bit in the mouth of.

Bit

The smallest unit of information, equivalent to a choice between two alternatives, as yes or no; on or off.

Bit

The physical representation of a bit of information in a computer memory or a data storage medium. Within a computer circuit a bit may be represented by the state of a current or an electrical charge; in a magnetic storage medium it may be represented by the direction of magnetization; on a punched card or on paper tape it may be represented by the presence or absence of a hole at a particular point on the card or tape.

Bit

A small quantity;
A spot of tea
A bit of paper

Bit

A small fragment of something broken off from the whole;
A bit of rock caught him in the eye

Bit

An indefinitely short time;
Wait just a moment
It only takes a minute
In just a bit

Bit

An instance of some kind;
It was a nice piece of work
He had a bit of good luck

Bit

Piece of metal held in horse's mouth by reins and used to control the horse while riding;
The horse was not accustomed to a bit

Bit

A unit of measurement of information (from Binary + digIT); the amount of information in a system having two equiprobable states;
There are 8 bits in a byte

Bit

A small amount of solid food; a mouthful;
All they had left was a bit of bread

Bit

A small fragment;
Overheard snatches of their conversation

Bit

A short theatrical performance that is part of a longer program;
He did his act three times every evening
She had a catchy little routine
It was one of the best numbers he ever did

Bit

The cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press;
He looked around for the right size bit

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