Physical Optimization of Quantum Error Correction Circuits

TL;DR

This paper explores physical optimization techniques for quantum error correction circuits, introducing parallel switching methods to accelerate encoding processes in quantum dot systems, with potential broad applicability.

Contribution

It presents a novel parallel switching approach for faster quantum gate operations, improving error correction encoding speed in quantum dot systems.

Findings

Parallel pulses double the encoding speed in Heisenberg-coupled quantum dots.

Parallel switching reduces error correction encoding time by approximately 50%.

The methods have potential applications across various quantum computing architectures.

Abstract

Quantum error correcting codes have been developed to protect a quantum computer from decoherence due to a noisy environment. In this paper, we present two methods for optimizing the physical implementation of such error correction schemes. First, we discuss an optimal quantum circuit implementation of the smallest error-correcting code (the three bit code). Quantum circuits are physically implemented by serial pulses, i.e. by switching on and off external parameters in the Hamiltonian one after another. In contrast to this, we introduce a new parallel switching method that allows faster gate operation by switching all external parameters simultaneously. These two methods are applied to electron spins in coupled quantum dots subject to a Heisenberg coupling H=J(t) S_1*S_2 which can generate the universal quantum gate `square-root-of-swap'. Using parallel pulses, the encoding for three-bit quantum error correction in a Heisenberg system can be accelerated by a factor of about two. We point out that parallel switching has potential applications for arbitrary quantum computer architectures.