Quantum computation and spin manipulation

Jincheng Zhang

This paper explores a novel computing architecture predicated on the unique properties of quantum spins. Traditional quantum computing architectures face challenges related to coherence, scalability, and control complexity. We propose a framework leveraging the intrinsic advantages of spin systems – their inherent robustness against environmental noise, their ability to represent information in multiple states simultaneously, and the potential for highly precise control – to construct a more efficient and reliable computing platform. The core of this architecture revolves around manipulating and correlating quantum spins to perform computations. We detail key aspects including spin initialization, coherent manipulation protocols, and measurement strategies. This approach offers a promising alternative to existing designs, potentially mitigating some of the significant hurdles in achieving practical quantum computation. The proposed architecture is fundamentally different in its approach, offering a new computational paradigm based on exploiting the full potential of quantum spin dynamics.

David Peter Divincenzo, Guido Burkard, Daniel Loss +1 more

David Peter Divincenzo

Jincheng Zhang

This paper proposes a novel approach to quantum computing utilizing the inherent properties of spin fluctuations within resistive switching memories, termed quantum computing resistors. The core concept leverages the statistical characteristics of spin fluctuations to encode and manipulate quantum bits (qubits). By precisely controlling external magnetic fields, we induce spin fluctuations and utilize their statistical behavior for qubit representation. Further manipulation of these fluctuations through external stimuli allows for precise control over the qubit state. This approach offers a fundamentally new architecture for quantum hardware, potentially mitigating some of the challenges associated with traditional qubit technologies. The theoretical framework is presented, detailing the key equations governing the system and outlining a pathway for realizing practical quantum computing using this mechanism. The paper explores the potential for scalability and robustness, acknowledging the key research areas that require further investigation. ---

N. M. Chtchelkatchev, Yuli V. Nazarov

We investigate the feasibility of manipulating individual spin in a superconducting junction where Bogoliubov quasiparticles can be trapped in discrete Andreev levels. We call this system an Andreev quantum dot (AQD) to be contrasted with a common semiconductor quantum dot. We show that the AQD can be brought into a spin-1/2 state. The coupling between the spin and superconducting current facilitates manipulation and measurement of this state. We demonstrate that one can operate two inductively coupled AQDs as a XOR gate; this enables quantum computing applications.

M. Mehring, V.A. Weberruß