Generation of n-qubit W states using Spin Torque
- Resource Type
- Working Paper
- Authors
- Sharma, Amritesh; Tulapurkar, Ashwin A.
- Source
- Phys. Rev. A 101, 062330 (2020)
- Subject
- Quantum Physics
Condensed Matter - Mesoscale and Nanoscale Physics
- Language
We examine here a scheme to generate a W state of an n-qubit system with all-to-all pairwise exchange interaction between n qubits. This relies on sharing of superposed excitations of a smaller number of $q$ qubits among others. We present a bound on the maximal jumps from q to n and formalize a scheme to generate $W_n$ state in $\mathcal{O}(\log_4 n)$ stages. We demonstrate this scheme in the context of spin torque based quantum computing architecture that are characterized by repeated interactions between static and flying qubits.