Abstract: A system and method for indicating, via a heralding signal, that an amplitude damping decay event has occurred within a quantum low-density parity-check code is disclosed. Logical information may be encoded into a superconducting qubit using one or more transmons, wherein a first level and a second level are encoded into a code space of the qubit, and at least one intermediate level outside of the code space characterizes an amplitude damping decay channel which is then used to herald an amplitude damping decay event. Dynamical decoupling pulse sequences may be used to drive such qubit structures and bias noise towards the amplitude damping decay channel. The one or more heralding signals within a lower-level code may then be used as input to a quantum low-density parity-check code for decoding syndrome measurements with the knowledge of occurrences of amplitude damping decay as indicated via the one or more heralding signals.

Abstract: A sensor system is presented comprising: a plurality of sensor units arranged in a predetermined arrangement to be exposed to an electromagnetic signal to be measured, a drive unit configured for providing one or more electromagnetic drive pulses to said sensing units to thereby affect one or more selected quantum properties associated with said plurality of sensor units, and an optical detector unit configured for detecting variation in one or more optical properties of the sensor units in response to input collected electromagnetic radiation; wherein said drive unit is configured to apply the electromagnetic drive pulses having a predetermined phase function on said plurality of sensor units.

Abstract: A system and method for indicating, via a heralding signal, that an amplitude damping decay event has occurred within a quantum low-density parity-check (LDPC) code is disclosed. Logical information may be encoded into a superconducting qubit using one or more transmons, wherein a first level and a second level are encoded into a code space of the qubit, and at least one intermediate level outside of the code space characterizes an amplitude damping decay channel which is then used to herald an amplitude damping decay event. Dynamical decoupling pulse sequences may be used to drive such qubit structures and bias noise towards the amplitude damping decay channel. The one or more heralding signals within a lower-level code may then be used as input to a quantum LDPC code for decoding syndrome measurements with the knowledge of occurrences of amplitude damping decay as indicated via the one or more heralding signals.

Abstract: A novel method for measurement of velocity and diffusion constant in microfluidic channels is presented using nano-NMR techniques. The fluid molecules of interest interact with color centers implanted in a suitable substrate such as diamond. A magnetic dipolar interaction between the fluid molecule spins influences the state of the NV, which can be probed using known NMR techniques. The color center response is read out optically and the NMR spectrum can be reconstructed from this optical information. The noise in the NMR spectra can be analyzed (e.g. in terms of its correlation function) to directly yield measurements of velocity and diffusion constant in the fluid, at orders of magnitude greater accuracy than otherwise possible.

Abstract: A method of hyperpolarisation of nuclear spins in one or more particle(s) moving relatively to a polarisation structure, wherein a polarisation of electron spins in the polarisation structure is transferred to the nuclear spins in the particle(s), wherein for one or more of the moving particle(s) within 20 nm from a surface of the polarisation structure, the correlation time of the interaction with the nearest polarisation structure electron spin due to the molecular motion is larger than the inverse of the nuclear Larmor frequency; the electron spins in the polarisation structure are polarised above thermal equilibrium; and the polarisation transfer is performed resonantly.

Abstract: The invention concerns a method for the hyperpolarisation of 13C nuclear spin in a diamond, comprising an optical pumping step, in which colour centre electron spins in the diamond are optically pumped. The method further comprises a transfer step in which the polarisation of a long-lived state of the colour centre electron spins is transferred to 13C nuclear spins in the diamond via a long-range interaction.

Abstract: The invention concerns a method for the hyperpolarisation of 13C nuclear spin in a diamond, comprising an optical pumping step, in which colour centre electron spins in the diamond are optically pumped. The method further comprises a transfer step in which the polarisation of a long-lived state of the colour centre electron spins is transferred to 13C nuclear spins in the diamond via a long-range interaction.

Abstract: A method of hyperpolarisation of nuclear spins in one or more particle(s) moving relatively to a polarisation structure, wherein a polarisation of electron spins in the polarisation structure is transferred to the nuclear spins in the particle(s), wherein for one or more of the moving particle(s) within 20 nm from a surface of the polarisation structure, the correlation time of the interaction with the nearest polarisation structure electron spin due to the molecular motion is larger than the inverse of the nuclear Larmor frequency; the electron spins in the polarisation structure are polarised above thermal equilibrium; and the polarisation transfer is performed resonantly.

Abstract: The invention concerns a method for the hyperpolarisation of 13C nuclear spin in a diamond, comprising an optical pumping step, in which colour centre electron spins in the diamond are optically pumped. The method further comprises a transfer step in which the polarisation of a long-lived state of the colour centre electron spins is transferred to 13C nuclear spins in the diamond via a long-range interaction.