de Brugière, Timothée Goubault Baboulin, Marc Valiron, Benoît Martiel, Simon Allouche, Cyril

Linear reversible circuits represent a subclass of reversible circuits with many applications in quantum computing. These circuits can be efficiently simulated by classical computers and their size is polynomially bounded by the number of qubits, making them a good candidate to deploy efficient methods to reduce computational costs. We propose a ne...

de Brugière, Timothée Goubault Baboulin, Marc Valiron, Benoît Martiel, Simon Allouche, Cyril

Current proposals for quantum compilers require the synthesis and optimization of linear reversible circuits and among them CNOT circuits. Since these circuits represent a significant part of the cost of running an entire quantum circuit, we aim at reducing their size. In this paper we present a new algorithm for the synthesis of CNOT circuits base...

f., william

We explore a particular way of reformulating quantum theory in classical terms, starting with phase space rather than Hilbert space, and with actual probability distributions rather than quasiprobabilities. The classical picture we start with is epistemically restricted, in the spirit of a model introduced by Spekkens. We obtain quantum theory only...

Gonzalez-Zalba, M. F. de Franceschi, S. Charbon, E. Meunier, T. Vinet, M. Dzurak, A. S.

Complementary metal-oxide semiconductor (CMOS) technology has radically reshaped the world by taking humanity to the digital age. Cramming more transistors into the same physical space has enabled an exponential increase in computational performance, a strategy that has been recently hampered by the increasing complexity and cost of miniaturization...

Johansson Saarijärvi, Max

Qubits (quantum bits) are what runs quantum computers, like a bit in classical computers. Quantum gates are used to operate on qubits in order to change their states. As such they are what ”programmes” a quantum computer. An unfortunate side effect of quantum physics is that coupling a quantum system (like our qubits) to an outside environment will...

Bevilacqua, Giuseppe Biancalana, Valerio Zanon-Willette, T. Arimondo, Ennio

Controlled modifications of the quantum magnetic response are produced in dressed systems by a high frequency, strong and not-resonant electromagnetic field. This quantum control is greatly enhanced and enriched by the harmonic, commensurable and orthogonally oriented dual dressing theoretically discussed here. The secondary field enables a fine tu...

Cochrane, Laurence Lundberg, Theodor Ibberson, David J. Ibberson, Lisa A. Hutin, Louis Bertrand, Benoit Stelmashenko, Nadia Robinson, Jason W.A. Vinet, Maud Seshia, Ashwin A.
...

Josephson parametric amplifiers (JPAs) approaching quantum-limited noise performance have been instrumental in enabling high fidelity readout of superconducting qubits and, recently, semiconductor quantum dots (QDs). We propose that the quantum capacitance arising in electronic two-level systems (the dual of Josephson inductance) can provide an alt...

Kinos, Adam Rippe, Lars Serrano, Diana Walther, Andreas Kröll, Stefan

We present two protocols for constructing quantum processor nodes in randomly doped rare-earth-ion crystals and analyze their properties. By varying the doping concentration and the accessible laser tunability, the processor nodes can contain anywhere from only a few tens to almost $1000$ qubits. Furthermore, the average number of qubits each qubit...

Michniewicz, John

The main challenge in quantum computing is not how to make qubits, but how to make a lot of them. Especially, the one-qubit-one-input approach is unsustainable for higher numbers. This issue has already been resolved in classical computing, and I investigate a similar solution for quantum. I evaluate the expansibility prospects of a multiplexing ch...

Mishra, Archana Simon, Pascal Hyart, Timo Trif, Mircea

Magnetic impurities in $s$-wave superconductors lead to spin-polarized Yu-Shiba-Rusinov (YSR) in-gap states. Chains of magnetic impurities offer one of the most viable routes for the realization of Majorana bound states which hold a promise for topological quantum computing. However, this ambitious goal looks distant since no quantum coherent degre...