What is reversible logic?

What is reversible logic?

The reversible logic operations can’t erase information and dissipate zero heat. The circuit actually operates in a backward operation, allows reproducing the inputs from the outputs and consumes zero power. As the basic elements of any logic circuit, logic gates are used to realize Boolean functions.

What is a reversible operation in logic gates?

Abstract A reversible logic gate is a memory-less logic element that realizes an in- jective logical function. Fredkin gate, Toffoli gate, interaction gate, and switch gate are typical ones. Then, a construction method of an almost garbage-less reversible combinatorial logic circuit is explained.

Which is the benefit of using reversible gate *?

Implementing the reversible logic has the advantages of reducing gate counts, garbage outputs as well as constant inputs. Addition, subtraction operations are realized using reversible DKG gate and compared with conventional gates.

What is Quantum cost in reversible logic?

The quantum cost of a reversible gate is the number of 1×1 and 2×2 reversible gates or quantum gates required in its design. The quantum costs of all reversible 1×1 and 2×2 gates are taken as unity [9].

What are the reversible operators?

One clear example of a reversible operator is negation. A not gate, or N gate (where the N stands for negation), is reversible because we simply switch or flip the polarity of a state a (true to false and false to true).

Is Turing machine reversible?

a Turing machine) is logically irreversible- its transition function lacks a single-valued inverse. Here it is shown that such machines may he made logically reversible at every step, while retainillg their simplicity and their ability to do general computations.

Which of these is a reversible operation?

Answer is (2) A logic gate is reversible if we can recover input data from the output.

Which of the following logic gate is reversible?

Toffoli gate
A reversible logic gate is a memory-less logic element that realizes an injective logical function. Fredkin gate, Toffoli gate, interaction gate, and switch gate are typical ones. Here, we investigate basic properties of reversible logic gates and circuits, which are needed in the following chapters.

What is Feynman gate?

Feynman gate is also recognized as controlled- not gate (CNOT). It has two inputs (A, B) and two outputs (P, Q). The outputs are defined by P=A, Q=A XOR B . This gate can be used to copy a signal. Since fan-out is not allowed in reversible logic circuits, the Feynman gate is used as the fan-out gate to copy a signal.

What is a quantum cost?

The quantum cost (QC) is a term that refers to the technological cost of building \textit{CNOT} gates [22]. The quantum cost based on the number of elementary gates required to build the quantum circuits [2].

What is irreversible logic?

Today’s computers erase a bit of information (in the sense used here) every time they perform a logic operation. These logic operations are therefore called “irreversible.” This erasure is done very inefficiently, and much more than kT is dissipated for each bit erased.