Efficient Construction of a Control Modular Adder on a Carry-Lookahead Adder Using Relative-phase Toffoli Gates
| Autor: | Kento Oonishi, Tomoki Tanaka, Shumpei Uno, Takahiko Satoh, Rodney Van Meter, Noboru Kunihiro |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
FOS: Physical sciences
control modular adder Shor’s algorithm Computer Science::Hardware Architecture Computer Science::Emerging Technologies ComputingMethodologies_SYMBOLICANDALGEBRAICMANIPULATION Computer Science (miscellaneous) Computer Science::Symbolic Computation Carry-lookahead adder Atomic physics. Constitution and properties of matter Electrical and Electronic Engineering Hardware_ARITHMETICANDLOGICSTRUCTURES Materials of engineering and construction. Mechanics of materials Engineering (miscellaneous) Quantum Physics Mechanical Engineering fault-tolerant quantum computers (FTQ) Condensed Matter Physics Computer Science Applications TheoryofComputation_MATHEMATICALLOGICANDFORMALLANGUAGES ComputingMethodologies_DOCUMENTANDTEXTPROCESSING TA401-492 Computer Science::Programming Languages Quantum Physics (quant-ph) noisy intermediate-scale quantum computers (NISQ) Software QC170-197 Hardware_LOGICDESIGN |
| Zdroj: | IEEE Transactions on Quantum Engineering, Vol 3, Pp 1-18 (2022) |
| Popis: | Control modular addition is a core arithmetic function, and we must consider the computational cost for actual quantum computers to realize efficient implementation. To achieve a low computational cost in a control modular adder, we focus on minimizingKQ (where K is the number of logical qubits required by the algorithm, and Q is the elementary gate step), defined by the product of the number of qubits and the depth of the circuit. In this article, we construct an efficient control modular adder with small KQ by using relative-phase Toffoli gates in two major types of quantum computers: fault-tolerant quantum computers (FTQ) on the logical layer and noisy intermediate-scale quantum computers (NISQ). We give a more efficient construction compared with Van Meter and Itoh’s, based on a carry-lookahead adder. In FTQ, $T$ gates incur heavy cost due to distillation, which fabricates ancilla for running $T$ gates with high accuracy but consumes a lot of especially prepared ancilla qubits and a lot of time. Thus, we must reduce the number of $T$ gates. We propose a new control modular adder that uses only 20% of the number of $T$ gates of the original. Moreover, when we take distillation into consideration, we find that we minimize $\text{KQ}_{T}$ (the product of the number of qubits and $T$-depth) by running $\Theta (n / \sqrt{\log n})$ $T$ gates simultaneously. In NISQ, cnot gates are the major error source. We propose a new control modular adder that uses only 35% of the number of cnot gates of the original. Moreover, we show that the $\text{KQ}_{\text{CX}}$ (the product of the number of qubits and cnot-depth) of our circuit is 38% of the original. Thus, we realize an efficient control modular adder, improving prospects for the efficient execution of arithmetic in quantum computers. |
| Databáze: | OpenAIRE |
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