Two qubits in one transmon -- QEC without ancilla hardware
- URL: http://arxiv.org/abs/2302.14707v2
- Date: Mon, 31 Jul 2023 11:36:55 GMT
- Title: Two qubits in one transmon -- QEC without ancilla hardware
- Authors: Alexander Simm, Shai Machnes, Frank K. Wilhelm
- Abstract summary: We show that it is theoretically possible to use higher energy levels for storing and controlling two qubits within a superconducting transmon.
The additional qubits could be used in algorithms which need many short-living qubits in error correction or by embedding effecitve higher connectivity in qubit networks.
- Score: 68.8204255655161
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We show that it is theoretically possible to use higher energy levels for
storing and controlling two qubits within a superconducting transmon. This is
done by identifying energy levels as product states between multiple effecitve
qubits. As a proof of concept we realise a complete set of gates necessary for
universal computing by numerically optimising control pulses for single qubit
gates on each of the qubits, entangling gates between the two qubits in one
transmon, and an entangling gate between two qubits from two coupled transmons.
The optimisation considers parameters which could make it possible to validate
this experimentally. With these control pulses it is in principle possible to
double the number of available qubits without any overhead in hardware. The
additional qubits could be used in algorithms which need many short-living
qubits such as syndrom qubits in error correction or by embedding effecitve
higher connectivity in qubit networks.
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