20 citations · 78 across the 24 of their papers we have counts for
24 papers
Measurement Geometry for Quantum Random Access Codes: Beyond Nayak Bound and Toward Optimality
Seiseki Akibue, Rudy Raymond, Suguru Tamaki +1
Quantum random access codes (QRACs) ask how well N classical bits can be encoded into M qubits while allowing any single bit to be recovered. Although the Nayak bound remains the s…
Circuit Optimization for Universality Transformation
Yasuaki Nakayama, Yuki Takeuchi, Seiseki Akibue
It is known that a computationally universal gate set can be transformed to a strictly universal one using one maximally imaginary state and…
Multi-qubit controlled gate synthesis without T-count overhead in the small-error limit
Soichiro Yamazaki, Seiseki Akibue, Kaoru Sano
We study the Clifford+T synthesis of quantum multiplexers : an -qubit control register selects which single-qubit gate acts on…
Uniqueness of imaginarity-assisted exact transformation from real orthogonal operations to arbitrary unitary operations
Yasuaki Nakayama, Yuki Takeuchi, Seiseki Akibue
The computational universality with an elementary gate set can be transformed to the strict universality by using a maximally imaginary state and some non…
Localization of joint quantum measurements on by entangled resources with Schmidt number at most
Seiseki Akibue, Jisho Miyazaki
Localizable measurements are joint quantum measurements that can be implemented using only non-adaptive local operations and shared entanglement. We provide a protocol-independent…
Clifford+V synthesis for multi-qubit unitary gates
Soichiro Yamazaki, Seiseki Akibue
We developed a general framework for synthesizing target gates by using a finite set of basic gates, which is a crucial step in quantum compilation. When approximating a gate in SU…
Existence of universal resource and uselessness of too entangled states for quantum metrology
Rina Miyajima, Yuki Takeuchi, Seiseki Akibue
We show (i) the existence of universal resource states for a certain class of linear Hamiltonians and (ii) the uselessness of highly entangled states for quantum metrology of linea…
Asymptotic Gate Count Bounds for Ancilla-Free Single-Qubit Synthesis with Arithmetic Gates
Kaoru Sano, Hayata Morisaki, Seiseki Akibue
We study ancilla-free approximation of single-qubit unitaries by gate sequences over Clifford+, where or their generalization. Let denote th…
Optimal ancilla-free Clifford+T synthesis for general single-qubit unitaries
Hayata Morisaki, Kaoru Sano, Seiseki Akibue
We propose two Clifford+ synthesis algorithms that are optimal with respect to -count. The first algorithm, called deterministic synthesis, approximates any single-qubit unit…
Duality of extremal quantum states in verification and data hiding
Seiseki Akibue, Yuki Takeuchi
Quantum state verification (QSV) and quantum data hiding (QDH) have so far been studied separately. QSV decides whether a given quantum state is close to the ideal one, with signif…
Optimizing Entanglement Manipulation via Algebraic-Geometric Decompositions and Semidefinite Programming Hierarchies
Seiseki Akibue, Jisho Miyazaki, Hiroyuki Osaka
In the study of distributed quantum information processing, it is a fundamental problem to optimize local operations in the implementation of non-local quantum operations assisted…
Error Crafting in Mixed Quantum Gate Synthesis
Nobuyuki Yoshioka, Seiseki Akibue, Hayata Morisaki +2
In fault-tolerant quantum computing, errors in unitary gate synthesis is comparable with noise inherent in the gates themselves. While mixed synthesis can suppress such coherent er…
On the hardness of conversion from entangled proof into separable one
Seiseki Akibue, Go Kato, Seiichiro Tani
A quantum channel whose image approximates the set of separable states is called a disentangler, which plays a prominent role in the investigation of variants of the computational…
Non-locality of conjugation symmetry: characterization and examples in quantum network sensing
Jisho Miyazaki, Seiseki Akibue
Some quantum information processing protocols necessitate quantum operations that are invariant under complex conjugation. In this study, we analyze the non-local resources necessa…
Probabilistic state synthesis based on optimal convex approximation
Seiseki Akibue, Go Kato, Seiichiro Tani
When preparing a pure state with a quantum circuit, there is an unavoidable approximation error due to the compilation error in fault-tolerant implementation. A recently proposed a…
Probabilistic unitary synthesis with optimal accuracy
Seiseki Akibue, Go Kato, Seiichiro Tani
The purpose of unitary synthesis is to find a gate sequence that optimally approximates a target unitary transformation. A new synthesis approach, called probabilistic synthesis, h…
Scalable implementation of mutually unbiased bases for -dimensional quantum key distribution
Takuya Ikuta, Seiseki Akibue, Yuya Yonezu +3
A high-dimensional quantum key distribution (QKD) can improve error rate tolerance and the secret key rate. Many -dimensional QKDs have used two mutually unbiased bases (MUBs),…
Entanglement and Causal Relation in distributed quantum computation
Seiseki Akibue
In this thesis, we investigate two different aspects of entanglement and classical communication in distributed quantum computation (DQC). In the first part, we analyze implementab…
Quadratic improvement on accuracy of approximating pure quantum states and unitary gates by probabilistic implementation
Seiseki Akibue, Go Kato, Seiichiro Tani
Pure quantum states are often approximately encoded as classical bit strings such as those representing probability amplitudes and those describing circuits that generate the quant…
Perfect discrimination of non-orthogonal quantum states with posterior classical partial information
Seiseki Akibue, Go Kato, Naoki Marumo
The indistinguishability of non-orthogonal pure states lies at the heart of quantum information processing. Although the indistinguishability reflects the impossibility of measurin…
Bipartite discrimination of independently prepared quantum states as a counterexample to a parallel repetition conjecture
Seiseki Akibue, Go Kato
For distinguishing quantum states sampled from a fixed ensemble, the gap in bipartite and single-party distinguishability can be interpreted as a nonlocality of the ensemble. In th…
Entanglement-assisted classical communication can simulate classical communication without causal order
Seiseki Akibue, Masaki Owari, Go Kato +1
Phenomena induced by the existence of entanglement, such as nonlocal correlations, exhibit characteristic properties of quantum mechanics distinguishing from classical theories. Wh…
Network coding for distributed quantum computation over cluster and butterfly networks
Seiseki Akibue, Mio Murao
To apply network coding for quantum computation, we study the distributed implementation of unitary operations over all separated input and output nodes of quantum networks. We con…
Two-party LOCC convertibility of quadpartite states and Kraus-Cirac number of two-qubit unitaries
Akihito Soeda, Seiseki Akibue, Mio Murao
Nonlocal properties (globalness) of a non-separable unitary determine how the unitary affects the entanglement properties of a quantum state. We apply a given two-qubit unitary on…