Exact simulations of quantum circuits (QCs) are currently limited to ~50 qubits because the memory and computational cost required to store the QC wave function scale exponentially with qubit number. Therefore, developing efficient schemes for approximate QC simulations is a current research focus. Here we show simulations of QCs with a method inspired by density functional theory (DFT), a widely used approach to study many-electron systems. Our calculations can predict marginal single-qubit probabilities (SQPs) with over 90% accuracy in several classes of QCs with universal gate sets, using memory and computational resources linear in qubit number despite the formal exponential cost of the SQPs. This is achieved by developing a mean-field description of QCs and formulating optimal single- and two-qubit gate functionals – analogs of exchange-correlation functionals in DFT – to evolve the SQPs without computing the QC wave function. Current limitations and future extensions of this formalism are discussed.
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An Offset-Canceling Approximate-DFT Beamforming Architecture for Wireless Transceivers
We describe a current-mode multi-beam beamforming approach for 5G wireless applications based on a low-complexity approximate-DFT (a-DFT). Dynamic current mirrors are used to cancel errors in the current copying and scaling operations required to realize a-DFT matrices, thus resulting in an accurate and scalable architecture. The circuit design for the case of 8-point a-DFT has been validated with transistor-level simulations in the UMC 0.18 μm CMOS process.
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- PAR ID:
- 10062382
- Date Published:
- Journal Name:
- IEEE International Symposium on Circuits and Systems (ISCAS)
- Page Range / eLocation ID:
- 1 to 5
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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- Free Publicly Accessible Full Text
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Accepted Manuscript1.0
- Conference Paper:
- https://doi.org/10.1109/ISCAS.2018.8351765
