Quantum computing architectures where atom-laser interactions form the basis of qubit manipulation, such as trapped ion and Rydberg systems, are leading the progress towards universal quantum computation. M Squared is developing many of the advanced laser systems that are underpinning this progress, including systems that are designed to implement quantum logic gates with optical and hyperfine qubits with high fidelity. High power systems that are enabling the scaling of qubit numbers are also being developed. These systems are described, along with an account of how the requirements of lasers for quantum computing experiments are expected to evolve in the future.
M Squared is developing quantum sensors for quantum gravimetry and inertial navigation. Using atom interferometry, each promises performance advantages over their classical counterparts. Each system is designed for use in the challenging operational environment of a moving platform, and incorporates active systems that compensate for the effects of environmental noise. Each sensor is presented along with a performance evaluation in laboratory settings and in field trials. An account is also given on how M Squared laser systems are being used to enable some of the world’s most advanced precision metrology experiments.
The increasing demand for high laser powers is placing huge demands on current laser technology. This is now reaching a limit, and to realise the existing new areas of research promised at high intensities, new cost-effective and technically feasible ways of scaling up the laser power will be required. Plasma-based laser amplifiers may represent the required breakthrough to reach powers of tens of petawatts to exawatts, because of the fundamental advantage that amplification and compression can be realised simultaneously in a plasma medium, which is also robust and resistant to damage, unlike conventional amplifying media. Raman amplification is a promising method, where a long pump pulse transfers energy to a lower frequency, short duration counter-propagating seed pulse through resonant excitation of a plasma wave that creates a transient plasma echelon, which backscatters the pump into the probe. While very efficient, this comes at the cost of noise amplification (from plasma density fluctuations) that needs to be controlled. Here we present the results of an experimental campaign where we have demonstrated chirped pulse Raman amplification (CPRA) at high intensities. We have used a frequency chirped pump pulse to limit the growth of noise amplification, while trying to maintain the amplification of the seed. In non-optimised conditions we show that indeed noise amplification can be controlled but reducing noise scattering also limits the seed amplification factor. Finally, we show that the gross efficiency is a few percent, consistent with previous measurements of CPRA obtained in capillaries with pump pulses of duration of a few hundred picoseconds.