123 citations · 527 across the 30 of their papers we have counts for
11 papers · 1 filter
Projected Least-Squares Quantum Process Tomography
Trystan Surawy-Stepney, Jonas Kahn, Richard Kueng +1
We propose and investigate a new method of quantum process tomography (QPT) which we call projected least squares (PLS). In short, PLS consists of first computing the least-squares…
Fast state tomography with optimal error bounds
Madalin Guta, Jonas Kahn, Richard Kueng +1
Projected least squares (PLS) is an intuitive and numerically cheap technique for quantum state tomography. The method first computes the least-squares estimator (or a linear inver…
Entanglement-fidelity relations for inaccurate ancilla-driven quantum computation
Tomoyuki Morimae, Jonas Kahn
It was shown in [T. Morimae, Phys. Rev. A {\bf81}, 060307(R) (2010)] that the gate fidelity of an inaccurate one-way quantum computation is upper bounded by a decreasing function o…
Local asymptotic normality for finite dimensional quantum systems
Jonas Kahn, Madalin Guta
We extend our previous results on local asymptotic normality (LAN) for qubits, to quantum systems of arbitrary finite dimension . LAN means that the quantum statistical model co…
Complementary reductions for two qubits
Denes Petz, Jonas Kahn
In connection with optimal state determination for two qubits, the question was raised about the maximum number of pairwise complementary reductions. The main result of the paper t…
Optimal estimation of qubit states with continuous time measurements
Madalin Guta, Bas Janssens, Jonas Kahn
We propose an adaptive, two steps strategy, for the estimation of mixed qubit states. We show that the strategy is optimal in a local minimax sense for the trace norm distance as w…