Bennett's laws of
quantum information
Quantum information is the information of the state of a quantum system. It is the basic entity of study in quantum information theory, and can be manipulated using quantum information processing techniques. Quantum information refers to both t ...
are:
# 1
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, ...
1
bit
The bit is the most basic unit of information in computing and digital communications. The name is a portmanteau of binary digit. The bit represents a logical state with one of two possible values. These values are most commonly represente ...
(classical),
# 1 qubit
1
ebit (
entanglement bit),
# 1 ebit + 1 qubit
2 bits (i.e.
superdense coding
In quantum information theory, superdense coding (also referred to as ''dense coding'') is a quantum communication protocol to communicate a number of classical bits of information by only transmitting a smaller number of qubits, under the assum ...
),
# 1 ebit + 2 bits
1 qubit (i.e.
quantum teleportation),
where
indicates "can do the job of".
These principles were formulated around 1993 by
Charles H. Bennett.
References
* ''Quantum Mechanics: The Physics of the Microscopic World'',
Benjamin Schumacher, The Teaching Company, lecture 21
Quantum information theory
{{computing-stub