Fermionic Bell-State Analyzer for Spin Qubits
Hans-Andreas Engel1,2 and
Daniel Loss2
We propose a protocol and physical implementation for partial
Bell-state measurements of Fermionic qubits, allowing for deterministic
quantum computing in solid-state systems without the need for
two-qubit gates. Our scheme consists of two spin qubits in a
double quantum dot where the two dots have different Zeeman
splittings and resonant tunneling between the dots is only allowed
when the spins are antiparallel. This converts spin parity into
charge information by means of a projective measurement and
can be implemented with established technologies. This measurement-based
qubit scheme greatly simplifies the experimental realization
of scalable quantum computers in electronic nanostructures.
2 Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
