Author

Tobias Haug

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Preprint Sep 2026

Syndrome measurements enable deterministic fault-tolerant $T$ gates

Non-Clifford gates are essential for universal quantum computation, yet implementing them fault-tolerantly remains a central challenge for stabilizer codes. Here, we show how a syndrome degree of freedom can mediate a logical non-Clifford gate. Releasing one stabilizer check makes an additional logical qubit available...

Kishor Bharti, Tobias Haug, Andrew Tanggara · 0 citations

Preprint Aug 2026

Fault-tolerant quantum computation cannot be achieved with constant spacetime overhead

The threshold theorem states that quantum computations can be made reliable below a physical error threshold, at the cost of additional physical qubits and circuit depth. Recent work has reduced these space and time overheads to polylogarithmic or nearly logarithmic scalings, but whether the cumulative spacetime overhe...

Kishor Bharti, Tobias Haug, Andrew Tanggara · 0 citations