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A Higher Radix Architecture for Quantum Carry-lookahead Adder
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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 O(n)-O(n/r) qubits and O(n)+O(n/r) T gates to get the correct answer in T-depth O(r)+O(log(n/r)), 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.
Title: A Higher Radix Architecture for Quantum Carry-lookahead Adder
Description:
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 O(n)-O(n/r) qubits and O(n)+O(n/r) T gates to get the correct answer in T-depth O(r)+O(log(n/r)), 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.
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