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SUMMARY:QSE Quantum Seminar: "Demonstrating high-fidelity operations using
  dual-rail cavity erasure qubits"
DTSTART:20260205T120000
DTEND:20260205T133000
DTSTAMP:20260916T053148Z
UID:320a81b98cdbb12c0a0461353617e2cc207a42a8c8ec7fbdb85972ad
CATEGORIES:Conferences - Seminars
DESCRIPTION:Nitish Mehta\nPlease join us for the QSE Center Quantum Sem
 inar with Nitish Mehta from the Quantum Circuits company who will give 
 the talk "Demonstrating high-fidelity operations using dual-rail cavity er
 asure qubits" on Thursday February 5th from 12pm to 1:30pm.\nLocation: CE
  1 105\n\nPizzas will be available at 12:00. All PhDs\, postdocs\, studen
 ts\, group leaders\, and PIs are welcome to join us.\n\nTITLE: "Demonstra
 ting high-fidelity operations using dual-rail cavity erasure qubits"\n\nAB
 STRACT: \nErasure qubits have re-emerged as a strategy to significantly
  reduce hardware requirements for quantum error correction through bot
 h higher thresholds and more favorable logical error suppression with 
 increasing code distance. Such erasure qubits are designed to ‘self-rep
 ort’ most of their errors without the need for additional ancilla q
 ubits. In this talk\, we will show how to realize erasure qubits usin
 g a simple superconducting cavity-based dual-rail encoding. In this d
 ual-rail cavity qubit we encode a qubit in the single-photon manifold of
  two cavity modes. The dominant error channel is single photon loss to 
 the vacuum state which can be efficiently detected\, converting this pho
 ton loss error into an erasure-like error.  The residual dephasing and
  bit-flip Pauli errors in our system are much rarer\, with error ra
 tes at least an order of magnitude smaller than our photon loss rates. Th
 is strong hierarchy of errors is necessary for our dual-rail cavity qub
 its to perform well in a quantum error correction setting such as in a 
 surface code. We also describe a new controlled-Z gate\, which uses an 
 auxiliary transmon-based coupler as a source of dispersive coupling betw
 een two dual-rail qubits. We benchmark this gate and experimentally sh
 ow that it has high-fidelity and low-erasure rates\, while also exhib
 iting a rather novel error ‘asymmetry’\, whereby the control qub
 it suffers from more decoherence than the target qubit\, leaving the tar
 get qubit mostly error-free. We show how to leverage this error asymmetr
 y for error correction. Finally\, we combine all these operations in
 to a multi-qubit system and show some early results of experiments on a 
 system consisting of five dual-rail cavity qubits. We perform logica
 l state preparation and measurement operations in a distance-2 surface co
 de\, showing how the code can correct for a single erasure and detect a s
 ingle Pauli error.  
LOCATION:CE 1 105 https://plan.epfl.ch/?room==CE%201%20105
STATUS:CONFIRMED
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