Operation of a silicon quantum processor unit cell above one kelvin

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Nature Apr 15; Epub Apr Quantum computers are expected to outperform conventional computers in several important applications, from molecular simulation to search algorithms, once they can be scaled up to large numbers-typically millions-of quantum bits qubits. For most solid-state qubit technologies-for example, those using superconducting circuits or semiconductor spins-scaling poses a considerable challenge because every additional qubit increases the heat generated, whereas the cooling power of dilution refrigerators is severely limited at their operating temperature less than millikelvin.

Here we demonstrate the operation of a scalable silicon quantum processor unit cell comprising two qubits confined to quantum dots at about 1. We achieve this by isolating the quantum dots from the electron reservoir, and then initializing and reading the qubits solely via tunnelling of electrons between the two quantum dots.

We coherently control the qubits using electrically driven spin resonance in isotopically enriched siliconSi, attaining single-qubit gate fidelities of Furthermore, we show that the unit cell can be operated at magnetic fields as low as 0.

The unit cell constitutes the core building block of a full-scale silicon quantum computer and satisfies layout constraints required by error-correction architectures. Our work indicates that a spin-based quantum computer could be operated at increased temperatures in a simple pumped He system which provides cooling power orders of magnitude higher than that of dilution refrigeratorsthus potentially enabling the integration of classical control electronics with the qubit array.

April Publication Analysis.A scalable silicon quantum processor unit cell made of two qubits confined to quantum dots operates at about 1.

Quantum computers are expected to outperform conventional computers in several important applications, from molecular simulation to search algorithms, once they can be scaled up to large numbers—typically millions—of quantum bits qubits 123. For most solid-state qubit technologies—for example, those using superconducting circuits or semiconductor spins—scaling poses a considerable challenge because every additional qubit increases the heat generated, whereas the cooling power of dilution refrigerators is severely limited at their operating temperature less than millikelvin 456.

Here we demonstrate the operation of a scalable silicon quantum processor unit cell comprising two qubits confined to quantum dots at about 1. We achieve this by isolating the quantum dots from the electron reservoir, and then initializing and reading the qubits solely via tunnelling of electrons between the two quantum dots 789. We coherently control the qubits using electrically driven spin resonance 1011 in isotopically enriched silicon 12 28 Si, attaining single-qubit gate fidelities of Furthermore, we show that the unit cell can be operated at magnetic fields as low as 0.

The unit cell constitutes the core building block of a full-scale silicon quantum computer and satisfies layout constraints required by error-correction architectures 8 Our work indicates that a spin-based quantum computer could be operated at increased temperatures in a simple pumped 4 He system which provides cooling power orders of magnitude higher than that of dilution refrigeratorsthus potentially enabling the integration of classical control electronics with the qubit array 18 Brief A scalable silicon quantum processor unit cell made of two qubits confined to quantum dots operates at about 1.

Abstract Quantum computers are expected to outperform conventional computers in several important applications, from molecular simulation to search algorithms, once they can be scaled up to large numbers—typically millions—of quantum bits qubits 123.Quantum computers are expected to outperform conventional computers for a range of important problems, once they can be scaled up to large numbers of quantum bits qubitstypically millions [1].

Operation of a silicon quantum processor unit cell above one kelvin

For semiconductor qubit technologies, scaling poses a significant challenge as every additional qubit increases the heat generated, while the cooling power of dilution refrigerators is severely limited at their operating temperature below mK. Furthermore, imperfections in the material disrupt the performance of each qubit.

operation of a silicon quantum processor unit cell above one kelvin

We achieve this by isolating the QDs from the electron reservoir, initialising and reading the qubits solely via tunnelling of electrons between the two QDs [2]. We coherently control the qubits using electrically-driven spin resonance EDSR in isotopically enriched silicon 28 Si, attaining single-qubit gate fidelities of We also present an electrostatically defined quantum dot that is robust to disorder, revealing a well defined shell structure [3].

We explore various fillings consisting of a single valence electron — namely 1, 5, 13 and 25 electrons — as potential qubits [4], and we identify fillings that yield a total spin-1 on the dot. Higher shell states are shown to be more susceptible to the driving field, leading to faster Rabi rotations of the qubit. Our work indicates that coherent control of electron quantum dot at higher shell states opens the possibility of an array of high fidelity qubits, while the fact that a spin-based quantum computer could be operated at elevated temperatures offers orders of magnitude higher cooling power than dilution refrigerators, potentially enabling classical control electronics to be integrated with the qubit array.

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Bertrand et al. Tarucha et al. Hornibrook et al. Center for Quantum Devices. Time: 18 Oct. Contact: Dorthe Bjergskov dorthe.Hit submit and our hamster slaves will spin up their wheels and report your personalised death clock so you can make a note in your diary.

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operation of a silicon quantum processor unit cell above one kelvin

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But we were aware of this. Sofia made a perfect job to customize the tour and it the communications were easy and fast.Taps Maiti has been promoted to the endowed and coveted rank of MSU Foundation Professor. President Lou Anna K.

Simon and Provost June Pierce Youatt presided over a high-profile ceremony at the Kellogg Conference Center on Friday, September 22, to honor him and all the newly named and endowed professors at MSU. His new rank recognizes Prof.

His work has been applied to business analytics, medical bioinformatics, and biomedical engineering. Leo Neufcourt joins MSU researchers - STT announces the arrival of Leo Neufcourt, who comes to us from the Ph. Leo completed his Master's-level research on stochastic analysis and Malliavin calculus under the supervision of Prof.

operation of a silicon quantum processor unit cell above one kelvin

Frederi Viens, Chair of STT, while he was visiting the Center for Stochastic Modeling (CIMFAV) at the Universidad de Valparaiso, Chile. Leo will spend two years as a research associate at MSU, where he will engage in many projects with various teams in STT and other units on campus.

Notably, he is already engaged in an exciting new collaboration between STT and the Facility for Rare Isotope Beams (FRIB) where he joins FRIB chief scientist Prof. Witold Nazarewicz and his team, STT Chairperson Frederi Viens, and STT's MSU Foundation Professor Taps Maiti, as they develop new Bayesian tools to quantify uncertainty in nuclear physics models. Leo is also starting a new collaboration with an STT team, as well as Prof.

Bengt Arnetz, Chair of the department of Family Medicine, and Prof. Judy Arnetz, Associate Chair for Research in the same department, where they will investigate new predictive models and their Bayesian analyses for improving healthcare outcomes in Michigan.

operation of a silicon quantum processor unit cell above one kelvin

We are very excited about Leo's arrival in STT at MSU, and look forward to his successful collaborations. Mark Meerschaert named among Thompson Reuters' Highly Cited Researchers - Along with five other MSU faculty members, Mark Meerschaert has been named as one of Thompson Reuters' Highly Cited Researchers for 2016. Congratulations to our new PhDs.

Pictured: Frederi Viens (Dept. Chair), Shunjie Guan, Liangliang Zhang, Guiling Shi, Pei Geng, Atreyee Majumder, Abdhi Sarkar, Sneha Jadhav, Taps Maiti (Graduate Director). At Purdue, he also served as director of the computational finance graduate program for more than a decade, and as associate director of the actuarial science undergraduate program, in which he designed new SOA-compliant courses and restructured offerings.

Prior to that, he was assistant professor of mathematics at the University of North Texas, and an NSF postdoctoral fellow in Barcelona and Paris. East Lansing, MI 48824 MSU is an affirmative-action, equal-opportunity employer. Livescore, statistics, betting odds. League tables, results, stats and free betting tips. Our site cannot work without cookies, so by using our services, you agree to our use of cookies.

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