Room-Temperature Quantum Error Correction with Nitrogen-Vacancy Centers

Corrina Alcoser

Hammad. A. Quraishi, Muhammad Aziz Majidi

Abstract Quantum error correction (QEC) is crucial for protecting quantum information from the decoherence caused by the interaction between the system and the environment. Many QEC techniques and algorithms have been proposed and demonstrated in various physical platforms at low temperatures, such as superconducting circuits, Rydberg’s atoms, and trapped ions. At room temperature, the QEC realization with nitrogen-vacancy (NV) centers in diamond has become very attractive due to the promising nature of the centers that have a relatively long spin coherence time and can be initialized and read out optically. Here, we investigate the potential realization of a simple repetitive three-qubit QEC scheme in which three NVs are coupled via dipolar coupling. A single NV qubit has been protected using two other coupled NVs which act as ancilla qubits. In this configuration of three NVs, a single NV qubit is protected from bit or phase-flip errors. This work paves the way for realizing five-qubit QEC with NVs at room temperature to preserve a qubit against any arbitrary single-qubit error.

Feng-yang Zhang, Chui-Ping Yang, He-Shan Song

David A. Hopper, Henry J. Shulevitz, Lee C. Bassett

The diamond nitrogen-vacancy (NV) center is a leading platform for quantum information science due to its optical addressability and room-temperature spin coherence. However, measurements of the NV center's spin state typically require averaging over many cycles to overcome noise. Here, we review several approaches to improve the readout performance and highlight future avenues of research that could enable single-shot electron-spin readout at room temperature.

Ｂｉｓｗａｓ　Ｂｉｓｗａｊｉｔ, P. Balasubramanian, Takenaka Kouta +3 more

The nitrogen-vacancy (NV) centers in diamond, also known as quantum bit operating at room temperature, have been recognized as a leading platform for quantum information and sensing. The electron spin of the NV center, along with the nuclear spins of the incorporated nitrogen atom and the neighboring isotope of carbon-13, act as a hybrid quantum register. By utilizing such quantum resister, quantum error correction, magnetic sensing and quantum teleportation have been demonstrated. Previously, we have developed ion beams of 65 keV adenine (C5N4Hn) containing four nitrogen atoms, 284 keV phthalocyanine (C32N8H18) containing eight nitrogen atoms, and 90 or 100 keV L-arginine (13C6H14 15N4O2) with isotopically enriched 13C and 15N. The implanted molecular ions are designed to dissociate into individual atoms at the surface, then progress through the diamond forming vacancies, halting with a spatial spread (~9±4 nm) for all molecular ions. The implanted nitrogen atoms combined with the vacancies via thermal treatment, forming the NV centers. In this study, we optimized the implantation energy of L-arginine ions to make a strong hyperfine coupling where the distance between NV and 13C is closer. A comparative analysis of the molecular ion energy for creating 15N-13C has been conducted where the resulting hybrid multi-qubits are characterized by pulsed optically detected magnetic resonance (ODMR), Ramsey spectroscopy, XY8 spectroscopy, etc. In the presentation we will explain the NV created by L-arginine implantation.

Tim Hoehn, Satcher Hsieh, P. Bhattacharyya +15 more