text: 403,142,1301013157398245376,1611666830,Arne Løhre Grimsmo 🧡,"New paper with Thomas Smith, @maja_cassidy, @Prof_D_Reilly and @BartlettQuantum on readout of Majorana qubits: <LINK>. Main takeaways: 1/3 1. Dispersive readout looks very promising. 2. But, there is some fine-print: The ""QNDness"" depends on the details of the Majorana qubit design and the readout protocol. In some cases the measured Majorana parity is manifestly conserved by the light-matter interaction. 2/3 This leads to a stronger notion of QND readout than for conventional superconducting qubits.  3. The ""longitudinal readout"" scheme we came up with in 2019 also looks extremely promising. Manifestly QND and might be faster and higher fidelity than dispersive. 3/3 @tahantech @maja_cassidy @Prof_D_Reilly @BartlettQuantum Yeah I believe that's true, the paper is about gates but he proposes longitudinal readout too in the last two sentences of his paper",https://arxiv.org/abs/2009.00027,"We analyze a readout scheme for Majorana qubits based on dispersive coupling to a resonator. We consider two variants of Majorana qubits: the Majorana transmon and the Majorana box qubit. In both cases, the qubit-resonator interaction can produce sizeable dispersive shifts in the MHz range for reasonable system parameters, allowing for submicrosecond readout with high fidelity. For Majorana transmons, the light-matter interaction used for readout manifestly conserves Majorana parity, which leads to a notion of quantum nondemolition (QND) readout that is stronger than for conventional charge qubits. In contrast, Majorana box qubits only recover an approximately QND readout mechanism in the dispersive limit where the resonator detuning is large. We also compare dispersive readout to longitudinal readout for the Majorana box qubit. We show that the latter gives faster and higher fidelity readout for reasonable parameters, while having the additional advantage of being manifestly QND, and so may prove to be a better readout mechanism for these systems. ",Dispersive readout of Majorana qubits,4,"['New paper with Thomas Smith, @maja_cassidy, @Prof_D_Reilly  and @BartlettQuantum on readout of Majorana qubits: <LINK>. Main takeaways:\n\n1/3', '1. Dispersive readout looks very promising.\n\n2. But, there is some fine-print: The ""QNDness"" depends on the details of the Majorana qubit design and the readout protocol. In some cases the measured Majorana parity is manifestly conserved by the light-matter interaction.\n\n2/3', 'This leads to a stronger notion of QND readout than for conventional superconducting qubits. \n\n3. The ""longitudinal readout"" scheme we came up with in 2019 also looks extremely promising. Manifestly QND and might be faster and higher fidelity than dispersive.\n\n3/3', ""@tahantech @maja_cassidy @Prof_D_Reilly @BartlettQuantum Yeah I believe that's true, the paper is about gates but he proposes longitudinal readout too in the last two sentences of his paper""]",20,09,865