Single-photon heralded two-qubit unitary gates for pairs of nitrogen-vacancy centers in diamond
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-11-27 |
| Journal | Physical review. A/Physical review, A |
| Authors | Chenxu Liu, Meenakshi Dutt, David Pekker |
| Institutions | University of Pittsburgh |
| Citations | 4 |
Abstract
Section titled āAbstractāThe implementation of a high-fidelity two-qubit quantum logic gate remains an\noutstanding challenge for isolated solid-state qubits such as Nitrogen-Vacancy\n(NV) centers in diamond. In this work, we show that by driving pairs of NV\ncenters to undergo photon scattering processes that flip their qubit state\nsimultaneously, we can achieve a unitary two-qubit gate conditioned upon a\nsingle photon detection event. Further, by exploiting quantum interference\nbetween the optical transitions of the NV centers electronic states, we realize\nthe existence of two special drive frequencies: a magic' point where the\nspin-preserving elastic scattering rates are suppressed, and a balancedā point\nwhere the state-flipping scattering rates are equal. We analyzed four different\ngate operation schemes that utilize these two special drive frequencies, and\nvarious combinations of polarization in the drive and collection paths. Our\ntheoretical and numerical calculations show that the gate fidelity can be as\nhigh as 97%. The proposed unitary gate, combined with available single qubit\nunitary operations, forms a universal gate set for quantum computing.\n
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
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