PreprintCC BY 4.0arXiv
Scalable Passive QRAM
Abstract
We present a blueprint for implementing the physical QRAM operation in a scalable, passive manner, proving its feasibility in principle. Our construction is passive because for an n-qubit address over N = 2n memory bits the energy cost per QRAM query is O(log N), and to our knowledge it is the first construction to use polylog N energy. The runtime for each query is O(log2 N). It is achieved by evolving a pre-manufactured time-independent 4-local Hamiltonian with O(N) terms where every qubit participates in at most 4 terms.
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BibTeX
@misc{jain2026scalable,
title = {{Scalable Passive QRAM}},
author = {Siddhartha Jain and Alexander M. Dalzell and Connor T. Hann},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.03700},
eprint = {2610.03700},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.03700},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Scalable Passive QRAM
AU - Siddhartha Jain
AU - Alexander M. Dalzell
AU - Connor T. Hann
PY - 2026
DA - 2026/10/02
PB - arXiv
DO - 10.48550/arxiv.2610.03700
UR - https://arxiv.org/abs/2610.03700
AB - We present a blueprint for implementing the physical QRAM operation in a scalable, passive manner, proving its feasibility in principle. Our construction is passive because for an n-qubit address over N = 2^n memory bits the energy cost per QRAM query is O(log N), and to our knowledge it is the first construction to use polylog N energy. The runtime for each query is O(log^2 N). It is achieved by evolving a pre-manufactured time-independent 4-local Hamiltonian with O(N) terms where every qubit participates in at most 4 terms.
ER -