Author
Ming-Zhong Ai
Bio: Ming-Zhong Ai is an academic researcher from University of Science and Technology of China. The author has contributed to research in topics: Qubit & Quantum system. The author has an hindex of 5, co-authored 19 publications receiving 76 citations.
Topics: Qubit, Quantum system, Laser, Quantum computer, Riemann hypothesis
Papers
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TL;DR: In this paper, the authors obtained nonadiabatic holonomic single-qubit quantum gates with optimal control in a trapped ion based on a three-level system with resonant driving, which has the advantages of rapid evolution and convenient implementation.
Abstract: Quantum computation with quantum gates induced by geometric phases is regarded as a promising strategy in fault-tolerant quantum computation, owing to its robustness against operational noise. However, because of the parametric restrictions in previous schemes, the main robust advantage of holonomic quantum gates is reduced. Here, we experimentally demonstrate a solution scheme, obtaining nonadiabatic holonomic single-qubit quantum gates with optimal control in a trapped ${}^{171}{\mathrm{Yb}}^{+}$ ion based on a three-level system with resonant driving, which also has the advantages of rapid evolution and convenient implementation. Compared with previous geometric gates and conventional dynamical gates, the superiority of our scheme is that it is more robust against control amplitude errors, which is confirmed by the gate infidelity as measured by both quantum-process tomography and random benchmarking methods. In addition, we outline how nontrivial two-qubit holonomic gates can also be realized using currently available experimental technology. Thus, our experiment confirms the feasibility of this robust and fast holonomic quantum-computation strategy.
37 citations
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TL;DR: In this article, a nonadiabatic holonomic single qubit quantum gates with optimal control in a trapped Yb ion based on three level systems with resonant drives are presented.
Abstract: Quantum computation with quantum gates induced by geometric phases is regarded as a promising strategy in fault tolerant quantum computation, due to its robustness against operational noises. However, because of the parametric restriction of previous schemes, the main robust advantage of holonomic quantum gates is smeared. Here, we experimentally demonstrate a solution scheme, demonstrating nonadiabatic holonomic single qubit quantum gates with optimal control in a trapped Yb ion based on three level systems with resonant drives, which also hold the advantages of fast evolution and convenient implementation. Compared with corresponding previous geometric gates and conventional dynamic gates, the superiority of our scheme is that it is more robust against control amplitude errors, which is confirmed by the measured gate infidelity through both quantum process tomography and random benchmarking methods. In addition, we also outline that nontrivial two qubit holonomic gates can also be realized within current experimental technologies. Therefore, our experiment validates the feasibility for this robust and fast holonomic quantum computation strategy.
21 citations
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TL;DR: In this paper, a laser machining method for fabricating an all-fiber pillar-in-bubble Fabry-Perot interferometer (FPI) was presented.
Abstract: We present a laser machining method for fabricating an all-fiber pillar-in-bubble Fabry-Perot interferometer (FPI), which is used for strain sensors with high sensitivity. The micro-structure of the air-bubble is fully controllable, especially the cavity length and sidewall thickness. The measured sensitivity of this strain sensor is as high as 56.69 pm/μe, which is several times higher than that of most FPI strain sensors reported to date. This sensor also has a low-temperature sensitivity of 0.682 pm/°C, reducing the cross-sensitivity between tensile strain and temperature to 0.012 μe/°C. Furthermore, such a sensor has the benefits of flexible design, simple fabrication, and high reproducibility, making it attractive for practical applications.
19 citations
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TL;DR: In this article, a modified dynamic decoupling scheme was proposed to suppress residual geometric dephasing in a single trapped 171 Yb + ion with low-frequency noise, and the experimental results showed that the modified scheme can reduce the dephase rate up to more than one order of magnitude compared with traditional dynamic decouple schemes.
Abstract: The geometric phase is regarded as a promising strategy in fault tolerance quantum information processing (QIP) domain due to its phase only depending on the geometry of the path executed. However, decoherence caused by environmental noise will destroy the geometric phase. Traditional dynamic decoupling sequences can eliminate dynamic dephasing but can not reduce residual geometric dephasing, which is still vital for high-precision quantum manipulation. In this work, we experimentally demonstrate effective suppression of residual geometric dephasing with modified dynamic decoupling schemes, using a single trapped 171 Yb + ion. The experimental results show that the modified schemes can reduce dephasing rate up to more than one order of magnitude compared with traditional dynamic decoupling schemes, where residual geometric dephasing dominates. Besides, we also investigate the impact of intensity and correlation time of the low-frequency noise on coherence of the quantum system. And we confirm these methods can be used in many cases.
11 citations
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TL;DR: In this paper, the authors demonstrate a type of microcavity with large tunable splitting of polarization modes, which consists of two ellipsoidal concave mirrors with controllable eccentricity by CO2 laser machining on fiber end facets.
Abstract: We demonstrate a type of microcavity with large tunable splitting of polarization modes. This polarization nondegenerate cavity consists of two ellipsoidal concave mirrors with controllable eccentricity by CO2 laser machining on fiber end facets. The experiment shows that the cavities can combine the advantages of high finesse above 104 and large tunable polarization mode splitting to the GHz range. As the splitting of the cavity can be finely controlled to match atom hyperfine levels or optomechanics phonons, it will blaze a way in experiments on cavity quantum electrodynamics and cavity optomechanics.
11 citations
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28,685 citations
01 May 2003
TL;DR: In this article, the authors demonstrate a universal geometric pi-phase gate between two beryllium ion-qubits, based on coherent displacements induced by an optical dipole force.
Abstract: Universal logic gates for two quantum bits (qubits) form an essential ingredient of quantum computation. Dynamical gates have been proposed in the context of trapped ions; however, geometric phase gates (which change only the phase of the physical qubits) offer potential practical advantages because they have higher intrinsic resistance to certain small errors and might enable faster gate implementation. Here we demonstrate a universal geometric pi-phase gate between two beryllium ion-qubits, based on coherent displacements induced by an optical dipole force. The displacements depend on the internal atomic states; the motional state of the ions is unimportant provided that they remain in the regime in which the force can be considered constant over the extent of each ion's wave packet. By combining the gate with single-qubit rotations, we have prepared ions in an entangled Bell state with 97% fidelity-about six times better than in a previous experiment demonstrating a universal gate between two ion-qubits. The particular properties of the gate make it attractive for a multiplexed trap architecture that would enable scaling to large numbers of ion-qubits.
746 citations
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11 Jan 2018
TL;DR: Bigler Conservation of Momentum Unit: Momentum MA Curriculum Frameworks (2016): HS-PS2-2 MA curriculum as discussed by the authors 2.5 Mastery Objective(s): (Students will be able to...) Solve problems involving collisions in which momentum is conserved, with or without an external impulse.
Abstract: Physics 1 Mr. Bigler Conservation of Momentum Unit: Momentum MA Curriculum Frameworks (2016): HS-PS2-2 MA Curriculum Frameworks (2006): 2.5 Mastery Objective(s): (Students will be able to...) Solve problems involving collisions in which momentum is conserved, with or without an external impulse. Success Criteria: Masses and velocities are correctly identified for each object, both before and after the collision. Variables are correctly identified and substituted correctly into the correct part of the equation. Algebra is correct and rounding to appropriate number of significant figures is reasonable. Tier 2 Vocabulary: momentum, collision Language Objectives: Explain what happens before, during, and after a collision from the point of view of one of the objects participating in the collision.
464 citations