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Quantum Magnets under Pressure: Controlling Elementary Excitations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>TlCuCl</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
We follow the evolution of the elementary excitations of the quantum antiferromagnet ${\mathrm{TlCuCl}}_{3}$ through the pressure-induced quantum critical point, which separates a dimer-based quantum disordered phase from a phase of long-ranged magnetic order. We demonstrate by neutron spectroscopy the continuous emergence in the weakly ordered state of a low-lying but …