CNOT gate operation on a photogenerated molecular electron spin-qubit pair

2020 ◽  
Vol 152 (1) ◽  
pp. 014503 ◽  
Author(s):  
Jordan N. Nelson ◽  
Jinyuan Zhang ◽  
Jiawang Zhou ◽  
Brandon K. Rugg ◽  
Matthew D. Krzyaniak ◽  
...  
Keyword(s):  
Electron Spin ◽  
Cnot Gate ◽  
Gate Operation ◽  
Molecular Electron ◽  
Spin Qubit

Engineering Electronic Structure to Protect Phase Memory in Molecular Qubits by Minimising Orbital Angular Momentum

2018 ◽  
Author(s):  
Ana Maria Ariciu ◽  
David H. Woen ◽  
Daniel N. Huh ◽  
Lydia Nodaraki ◽  
Andreas Kostopoulos ◽  
...  
Keyword(s):  
Electron Spin ◽  
Quantum Coherence ◽  
Quantum Information Processing ◽  
Pulse Sequences ◽  
Grover Algorithm ◽  
Ligand Shell ◽  
Information Strategies ◽  
Spin Qubit ◽  
Molecular Spin ◽  
The Impact

Using electron spins within molecules for quantum information processing (QIP) was first proposed by Leuenberger and Loss (1), who showed how the Grover algorithm could be mapped onto a Mn12 cage (2). Since then several groups have examined two-level (S = ½) molecular spin systems as possible qubits (3-12). There has also been a report of the implementation of the Grover algorithm in a four-level molecular qudit (13). A major challenge is to protect the spin qubit from noise that causes loss of phase information; strategies to minimize the impact of noise on qubits can be categorized as corrective, reductive, or protective. Corrective approaches allow noise and correct for its impact on the qubit using advanced microwave pulse sequences (3). Reductive approaches reduce the noise by minimising the number of nearby nuclear spins (7-11), and increasing the rigidity of molecules to minimise the effect of vibrations (which can cause a fluctuating magnetic field via spin-orbit coupling) (9,11); this is essentially engineering the ligand shell surrounding the electron spin. A protective approach would seek to make the qubit less sensitive to noise: an example of the protective approach is the use of clock transitions to render spin states immune to magnetic fields at first order (12). Here we present a further protective method that would complement reductive and corrective approaches to enhancing quantum coherence in molecular qubits. The target is a molecular spin qubit with an effective 2S ground state: we achieve this with a family of divalent rare-earth molecules that have negligible magnetic anisotropy such that the isotropic nature of the electron spin renders the qubit markedly less sensitive to magnetic noise, allowing coherent spin manipulations even at room temperature. If combined with the other strategies, we believe this could lead to molecular qubits with substantial advantages over competing qubit proposals.<br>

Teleportation of a controlled-NOT gate for photon and electron-spin qubits assisted by the nitrogen-vacancy center

2015 ◽  
Vol 15 (15&16) ◽  
pp. 1397-1419
Author(s):  
Ming-Xing Luo ◽  
Hui-Ran Li
Keyword(s):  
Electron Spin ◽  
Spin System ◽  
Room Temperature ◽  
Coherence Time ◽  
Nitrogen Vacancy ◽  
Cnot Gate ◽  
Long Distance ◽  
Two Photon ◽  
Nitrogen Vacancy Center ◽  
Vacancy Center

Teleportations of quantum gates are very important in the construction of quantum network and teleportation-based model of quantum computation. Assisted with nitrogenvacancy centers, we propose several schemes to teleport the quantum CNOT gate. Deterministic CNOT gate may be implemented on a remote two-photon system, remote two electron-spin system, hybrid photon-spin system or hybrid spin-photon system. Each photon only interacts with one spin each time. Moreover, quantum channel may be constructed by all combinations of the photon or electron-spin entanglement, or their hybrid entanglement. Since these electron-spin systems have experimentally shown a long coherence time even at the room temperature, our schemes provide useful ways for long-distance quantum applications.

scholarly journals Three-stage decoherence dynamics of an electron spin qubit in an optically active quantum dot

2015 ◽  
Vol 11 (12) ◽  
pp. 1005-1008 ◽  
Author(s):  
Alexander Bechtold ◽  
Dominik Rauch ◽  
Fuxiang Li ◽  
Tobias Simmet ◽  
Per-Lennart Ardelt ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Electron Spin ◽  
Optically Active ◽  
Spin Qubit

scholarly journals Quantum non-demolition measurement of an electron spin qubit

2019 ◽  
Vol 14 (6) ◽  
pp. 555-560 ◽  
Author(s):  
Takashi Nakajima ◽  
Akito Noiri ◽  
Jun Yoneda ◽  
Matthieu R. Delbecq ◽  
Peter Stano ◽  
...  
Keyword(s):  
Electron Spin ◽  
Spin Qubit

scholarly journals Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals

2019 ◽  
Vol 10 (5) ◽  
pp. 1483-1491 ◽  
Author(s):  
Jake McGuire ◽  
Haralampos N. Miras ◽  
Emma Richards ◽  
Stephen Sproules
Keyword(s):  
Electron Spin ◽  
Organic Radicals ◽  
Organic Radical ◽  
Single Qubit ◽  
Spin Qubit ◽  
Molecular Semiconductor

An organic radical attached to gold represents an electrically addressable prototype electron spin qubit with an impressively long coherence lifetime.

Creation of charged excitons with two-color excitation method and initialization of electron spin qubit in quantum dots

2011 ◽  
Vol 98 (3) ◽  
pp. 032101 ◽  
Author(s):  
Hideki Gotoh ◽  
Haruki Sanada ◽  
Hidehiko Kamada ◽  
Hiroshi Yamaguchi ◽  
Tetsuomi Sogawa
Keyword(s):  
Quantum Dots ◽  
Electron Spin ◽  
Spin Qubit ◽  
Excitation Method

An entanglement concentration protocol for cluster states using CNOT gate operation

Pramana ◽  
2015 ◽  
Vol 86 (5) ◽  
pp. 973-983 ◽  
Author(s):  
BINAYAK S CHOUDHURY ◽  
ARPAN DHARA
Keyword(s):  
Entanglement Concentration ◽  
Cnot Gate ◽  
Cluster States ◽  
Gate Operation

scholarly journals Fast spin-valley-based quantum gates in Si with micromagnets

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Peihao Huang ◽  
Xuedong Hu
Keyword(s):  
Electron Spin ◽  
Quantum Information Processing ◽  
Spin Orbit Coupling ◽  
Spin Dephasing ◽  
Spin Qubit ◽  
Electrical Manipulation ◽  
Charge Noise ◽  
Fast Spin ◽  
Sweet Spots

AbstractAn electron spin qubit in silicon quantum dots holds promise for quantum information processing due to the scalability and long coherence. An essential ingredient to recent progress is the employment of micromagnets. They generate a synthetic spin–orbit coupling (SOC), which allows high-fidelity spin manipulation and strong interaction between an electron spin and cavity photons. To scaled-up quantum computing, multiple technical challenges remain to be overcome, including controlling the valley degree of freedom, which is usually considered detrimental to a spin qubit. Here, we show that it is possible to significantly enhance the electrical manipulation of a spin qubit through the effect of constructive interference and the large spin-valley mixing. To characterize the quality of spin control, we also studied spin dephasing due to charge noise through spin-valley mixing. The competition between the increased control strength and spin dephasing produces two sweet-spots, where the quality factor of the spin qubit can be high. Finally, we reveal that the synthetic SOC leads to distinctive spin relaxation in silicon, which explains recent experiments.

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