Semiconductor quantum computation

Abstract

Semiconductors, a significant type of material in the information era, are becoming more and more powerful in the field of quantum information. In the last decades, semiconductor quantum computation was investigated thoroughly across the world and developed with a dramatically fast speed. The researches vary from initialization, control and readout of qubits, to the architecture of fault tolerant quantum computing. Here, we first introduce the basic ideas for quantum computing, and then discuss the developments of single-and twoqubit gate control in semiconductor. Till now, the qubit initialization, control and readout can be realized with relatively high fidelity and a programmable two-qubit quantum processor was even demonstrated. However, to further improve the qubit quality and scale it up, there are still some challenges to resolve such as the improvement of readout method, material development and scalable designs. We discuss these issues and introduce the forefronts of progress. Finally, considering the positive trend of the research on semiconductor quantum devices and recent theoretical work on the applications of quantum computation, we anticipate that semiconductor quantum computation may develop fast and will have a huge impact on our lives in the near future.

Programmable quantum motherboard for logical qubits

“…A unique observation for our platform is the fact that the presence of a comb with frequency degeneration in the central zone corresponding to (5) does not fix one degree of freedom g, while maintaining the relationship between f n and g (see 6). This allows programming the energy dynamics of a QMB according to the formula for energy in 2-nd atom E(x 2 ):…”

Correlated spectrum of distant semiconductor qubits coupled by microwave photons

“…Semiconductor quantum dots are compatible with conventional manufacturing technology, and are a promising candidate for scalable quantum computing [1][2][3]. They have attracted significant interest [4,5] in systems based on GaAs [6][7][8][9][10][11], Si [12][13][14][15][16][17][18], and Ge [19,20]. However, as the number of qubits increases [21][22][23][24], the coupling of arbitrary pairs of distant qubits and the characterization of coupled qubits remain outstanding challenges.…”

A Scalable Cryo-CMOS Controller for the Wideband Frequency-Multiplexed Control of Spin Qubits and Transmons

“…These include near-term applications requiring hundreds of quantum bits (qubits), such as elucidating the hidden mechanisms of chemical reactions [1], and long-term applications requiring millions of qubits, such as the efficient search in huge databases with Grover's algorithm [2]. While today's quantum computers comprise only a few tens of qubits (<100) [3]- [6], implementing the required large-scale quantum computers (10 3 -10 6 qubits) advocates a scalable approach both for the qubits, e.g., the use of high-fidelity solidstate qubit technologies [7], such as spin qubits and transmons, and for the classical electronics required to drive and read out the qubits.…”