collaborators

5 papers

quant-ph2025

Simulating the quantum switch with quantum circuits is computationally hard

Jessica Bavaresco, Hlér Kristjánsson, Mio Murao +4

Higher-order transformations acting on input quantum channels in an indefinite causal order, such as the quantum switch, cannot be described by quantum circuits using the same numb…

quant-ph2025

Analytical Lower Bound on Query Complexity for Transformations of Unknown Unitary Operations

Tatsuki Odake, Satoshi Yoshida, Mio Murao

Recent developments have revealed deterministic and exact protocols for performing complex conjugation, inversion, and transposition of a general -dimensional unknown unitary op…

quant-ph2025

Robust Error Accumulation Suppression for Quantum Circuits

Tatsuki Odake, Philip Taranto, Nobuyuki Yoshioka +4

We present a \textit{robust error accumulation suppression} (\textbf{REAS}) technique to manage errors in quantum computers. Our method reduces the accumulation of errors in any qu…

quant-ph2025

Universal algorithm for transforming Hamiltonian eigenvalues

Tatsuki Odake, Hlér Kristjánsson, Philip Taranto +1

Manipulating Hamiltonians governing physical systems has found a broad range of applications, from quantum chemistry to semiconductor design. In this work, we provide a new way of…

quant-ph2024

Exponential separation in quantum query complexity of the quantum switch with respect to simulations with standard quantum circuits

Hlér Kristjánsson, Tatsuki Odake, Satoshi Yoshida +4

Quantum theory is consistent with a computational model permitting black-box operations to be applied in an indefinite causal order, going beyond the standard circuit model of comp…