10.9k citations
- The University of TokyoJP1.8k papers
- University of TsukubaJP1.7k papers
- The Ohio State UniversityUS1.7k papers
- University of MichiganUS1.6k papers
- University of GenevaCH1.6k papers
- Yale UniversityUS1.6k papers
- University of ChicagoUS1.6k papers
- Centre National de la Recherche ScientifiqueFR1.6k papers
- Lawrence Berkeley National LaboratoryUS1.6k papers
- Argonne National LaboratoryUS1.6k papers
- University of BolognaIT1.6k papers
- University of New MexicoUS1.6k papers
7 papers · 2 filters
Selective writing and read-out of a register of static qubits
A. De Pasquale, F. Ciccarello, K. Yuasa +1
We propose a setup comprising an arbitrarily large array of static qubits (SQs), which interact with a flying qubit (FQ). The SQs work as a quantum register, which can be written o…
From superoperator formalism to nonequilibrium Thermo Field Dynamics
Yusuke Nakamura, Yoshiya Yamanaka
Emphasizing that the specification of the representation space or the quasiparticle picture is essential in nonequilibrium quantum field system, we have constructed the unique unpe…
Ergodic and Mixing Quantum Channels in Finite Dimensions
Daniel Burgarth, Giulio Chiribella, Vittorio Giovannetti +2
The paper provides a systematic characterization of quantum ergodic and mixing channels in finite dimensions and a discussion of their structural properties. In particular, we disc…
Possibility of a minimal purity-measurement scheme critically depends on the parity of dimension of the quantum system
Toru Tanaka, Gen Kimura, Hiromichi Nakazato
In this paper, we investigate the possibility of measuring the purity of a quantum state (and the overlap between two quantum states) within a minimal model where the measurement d…
A controlled-NOT gate in a chain of qubits embedded in a spin field-effect transistor and its process tomography
Makoto Unoki, Hiromichi Nakazato, Kazuya Yuasa +1
We have investigated the realizability of the controlled-NOT (CNOT) gate and characterized the gate operation by quantum process tomography for a chain of qubits, realized by elect…
A measurement scheme for purity based on two two-body gates
Hiromichi Nakazato, Toru Tanaka, Kazuya Yuasa +2
A scheme for measuring the purity of a quantum system with a finite number of levels is presented. The method makes use of two square root of SWAP gates and only hinges on measurem…