scholarly journals Efficient controlled-phase gate for single-spin qubits in quantum dots

2011 ◽  
Vol 83 (12) ◽  
Author(s):  
T. Meunier ◽  
V. E. Calado ◽  
L. M. K. Vandersypen
Keyword(s):  
Quantum Dots ◽  
Spin Qubits ◽  
Single Spin ◽  
Phase Gate ◽  
Controlled Phase Gate

Spin-based scheme for implementing an N-qubit tunable controlled phase gate in quantum dots by interference of polarized photons

Laser Physics ◽  
2014 ◽  
Vol 24 (4) ◽  
pp. 045204 ◽  
Author(s):  
Wen-Xue Cui ◽  
Shi Hu ◽  
Qi Guo ◽  
Hong-Fu Wang ◽  
Shou Zhang
Keyword(s):  
Quantum Dots ◽  
Phase Gate ◽  
Controlled Phase Gate ◽  
Polarized Photons

scholarly journals Embedded quantum-error correction and controlled-phase gate for molecular spin qubits

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025134
Author(s):  
A. Chiesa ◽  
F. Petiziol ◽  
E. Macaluso ◽  
S. Wimberger ◽  
P. Santini ◽  
...  
Keyword(s):  
Error Correction ◽  
Quantum Error Correction ◽  
Spin Qubits ◽  
Phase Gate ◽  
Molecular Spin ◽  
Controlled Phase Gate ◽  
Quantum Error

scholarly journals An Operation Guide of Si-MOS Quantum Dots for Spin Qubits

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2486
Author(s):  
Rui-Zi Hu ◽  
Rong-Long Ma ◽  
Ming Ni ◽  
Xin Zhang ◽  
Yuan Zhou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Rabi Oscillation ◽  
Stability Diagram ◽  
Near Neighbor ◽  
Spin Qubits ◽  
Orbital State ◽  
Single Spin ◽  
Spin Qubit ◽  
Charge Stability

In the last 20 years, silicon quantum dots have received considerable attention from academic and industrial communities for research on readout, manipulation, storage, near-neighbor and long-range coupling of spin qubits. In this paper, we introduce how to realize a single spin qubit from Si-MOS quantum dots. First, we introduce the structure of a typical Si-MOS quantum dot and the experimental setup. Then, we show the basic properties of the quantum dot, including charge stability diagram, orbital state, valley state, lever arm, electron temperature, tunneling rate and spin lifetime. After that, we introduce the two most commonly used methods for spin-to-charge conversion, i.e., Elzerman readout and Pauli spin blockade readout. Finally, we discuss the details of how to find the resonance frequency of spin qubits and show the result of coherent manipulation, i.e., Rabi oscillation. The above processes constitute an operation guide for helping the followers enter the field of spin qubits in Si-MOS quantum dots.

scholarly journals Fast and high-fidelity entangling gate through parametrically modulated longitudinal coupling

Quantum ◽  
2017 ◽  
Vol 1 ◽  
pp. 11 ◽  
Author(s):  
Baptiste Royer ◽  
Arne L. Grimsmo ◽  
Nicolas Didier ◽  
Alexandre Blais
Keyword(s):  
Quantum Computing ◽  
Quantum Computation ◽  
Effective Interaction ◽  
Interaction Strength ◽  
High Fidelity ◽  
Spin Qubits ◽  
Universal Quantum ◽  
Phase Gate ◽  
Controlled Phase Gate

We investigate an approach to universal quantum computation based on the modulation of longitudinal qubit-oscillator coupling. We show how to realize a controlled-phase gate by simultaneously modulating the longitudinal coupling of two qubits to a common oscillator mode. In contrast to the more familiar transversal qubit-oscillator coupling, the magnitude of the effective qubit-qubit interaction does not rely on a small perturbative parameter. As a result, this effective interaction strength can be made large, leading to short gate times and high gate fidelities. We moreover show how the gate infidelity can be exponentially suppressed with squeezing and how the entangling gate can be generalized to qubits coupled to separate oscillators. Our proposal can be realized in multiple physical platforms for quantum computing, including superconducting and spin qubits.

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