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A Higher radix architecture for quantum carry-lookahead adder.

ABSTRACT: In this paper, we propose an efficient quantum carry-lookahead adder based on the higher radix structure. For the addition of two n-bit numbers, our adder uses [Formula: see text] qubits and [Formula: see text] T gates to get the correct answer in T-depth [Formula: see text], where r is the radix. Quantum carry-lookahead adder has already attracted some attention because of its low T-depth. Our work further reduces the overall cost by introducing a higher radix layer. By analyzing the performance in T-depth, T-count, and qubit count, it is shown that the proposed adder is superior to existing quantum carry-lookahead adders. Even compared to the Draper out-of-place adder which is very compact and efficient, our adder is still better in terms of T-count.

SUBMITTER: Wang S

PROVIDER: S-EPMC10539406 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature

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A Higher radix architecture for quantum carry-lookahead adder.

Wang Siyi S Baksi Anubhab A Chattopadhyay Anupam A

Scientific reports 20230928 1

In this paper, we propose an efficient quantum carry-lookahead adder based on the higher radix structure. For the addition of two n-bit numbers, our adder uses [Formula: see text] qubits and [Formula: see text] T gates to get the correct answer in T-depth [Formula: see text], where r is the radix. Quantum carry-lookahead adder has already attracted some attention because of its low T-depth. Our work further reduces the overall cost by introducing a higher radix layer. By analyzing the performanc ...[more]

PMID: 37770461

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