Centre for Quantum Computation and Communication Technology

Dipolar Coupling Errors in Nuclear Spin Qubits

ABSTRACT Nuclear spins have been studied since the beginning of quantum information science since they form the prototypical qubit with long coherence times and high‐fidelity operation. To perform practical fault‐tolerant quantum computations, however, not only do we require prec...

On the complexity of isomorphism problems for tensors, groups, and polynomials III: actions by classical groups

Abstract We study the complexity of isomorphism problems for tensors, represented in coordinates by multiway arrays, under natural actions by classical groups such as orthogonal, unitary, and symplectic groups. These problems arise naturally in statistical data analysis and quant...

In-line fiber-integrated photon-pair generation from van der Waals crystals

Miniaturized quantum light sources that operate directly in optical fibers are an attractive platform for optical quantum technologies. However, most miniaturized spontaneous parametric down-conversion (SPDC) sources still rely on objective-lens-based free-space pumping and colle...

Sequential state preparation and measurement of multiple qubits via a single channel

Accurate state preparation and measurement (SPAM) is vital for performing high-fidelity quantum computation 1–3 . However, systems typically use individual readout hardware for each qubit, presenting a significant overhead to the scale-up of quantum computers 2,4 . In response, f...

Quantum spectroscopy with undetected photons for biomolecular sensing in the mid-infrared

We investigate numerical modelling of quantum spectroscopy with undetected photons for protein detection in the mid-infrared spectral region. Classical Fourier-transform infrared spectroscopy of protein samples (bovine serum albumin and N-terminal pro-brain natriuretic peptide) i...