45 citations · 102 across the 17 of their papers we have counts for
18 papers
Limits of independent and identical measurements for quantum illumination with an unknown return phase
Ko Shiraiwa, Shingo Kukita
Quantum illumination exploits entanglement between a transmitted signal and a retained idler to improve the error-probability exponent of target detection by roughly a factor of fo…
Suppressing Detuning-Induced Bias in Ramsey Magnetometry with Composite Pulses
Shingo Kukita, Kento Nawata, Yuichiro Matsuzaki
Quantum sensing estimates a physical parameter encoded in the state of a probe; with independent spin probes the precision follows the standard quantum limit. Studies of sensing pr…
Mitigating Detuning-Induced Systematic Errors in Entanglement-Enhanced Metrology
Shingo Kukita, Yuichiro Matsuzaki
Quantum sensing leverages non-classical resources to enhance precision. In particular, Greenberger-Horne-Zeilinger (GHZ) states can, in principle, attain the Heisenberg limit that…
Geometric Construction of Dynamically Corrected Quantum Gates
Shingo Kukita, Yasushi Kondo
The foundation of quantum technologies lies in the precise control of quantum systems. It is crucial to implement dynamically corrected quantum gates (DCQG), which compensate for i…
Optimal quantum controls robust against detuning error
Shingo Kukita, Haruki Kiya, Yasushi Kondo
Precise control of quantum systems is one of the most important milestones for achieving practical quantum technologies, such as computation, sensing, and communication. Several fa…
Artificial Relaxation in NMR Experiment
Shingo Kukita, Haruki Kiya, Yasushi Kondo
Environmental noises cause the relaxation of quantum systems and decrease the precision of operations. Apprehending the relaxation mechanism via environmental noises is essential f…
Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit
Hideaki Okane, Shunsuke Kamimura, Shingo Kukita +2
We discuss a quantum refrigerator to increase the ground state probability of a target qubit whose energy difference between the ground and excited states is less than the thermal…
General off-resonance error robust symmetric composite pulses with three elementary operations
Shingo Kukita, Haruki Kiya, Yasushi Kondo
Accurate quantum control is a key technology for realizing quantum information processing, such as quantum communication and quantum computation. In reality, a quantum state under…
Short composite rotation robust against two common systematic errors
Shingo Kukita, Haruki Kiya, Yasushi Kondo
Systematic errors hinder precise quantum control. Pulse length errors (PLEs) and off-resonance errors (OREs) are typical systematic errors that are encountered during one-qubit con…
Polarizing electron spins with a superconducting flux qubit
Shingo Kukita, Hideaki Ookane, Yuichiro Matsuzaki +1
Electron spin resonance (ESR) is a useful tool to investigate properties of materials in magnetic fields where high spin polarization of target electron spins is required in order…
Heisenberg-limited quantum metrology using collective dephasing
Shingo Kukita, Yuichiro Matsuzaki, Yasushi Kondo
The goal of quantum metrology is the precise estimation of parameters using quantum properties such as entanglement. This estimation usually consists of three steps: state preparat…
Controllable non-Markovianity in phase relaxation
Shingo Kukita, Yasushi Kondo, Mikio Nakahara
Recently remarkable progress in quantum technology has been witnessed. In view of this it is important to investigate an open quantum system as a model of such quantum devices. Qua…
An upper bound on the number of compatible parameters in simultaneous quantum estimation
Shingo Kukita
Simultaneous estimation of multiple parameters is required in many practical applications. A lower bound on the variance of simultaneous estimation is given by the quantum Fisher i…
Parameter estimation by decoherence in the double-slit experiment
Akira Matsumura, Taishi Ikeda, Shingo Kukita
We discuss a parameter estimation problem using quantum decoherece in the double-slit interferometer. We consider a particle coupled to a massive scalar field after the particle pa…
Harvesting large scale entanglement in de Sitter space with multiple detectors
Shingo Kukita, Yasusada Nambu
We consider entanglement harvesting in de Sitter space using a model of multiple qubit detectors. We obtain the formula of the entanglement negativity for this system. Applying the…
Entanglement dynamics in de Sitter spacetime
Shingo Kukita, Yasusada Nambu
We apply the master equation with dynamical coarse graining approximation to a pair of detectors interacting with a scalar field. By solving the master equation numerically, we inv…
Perturbative Dynamics of Open Quantum Systems by Renormalization Group Method
Shingo Kukita
We analyze perturbative dynamics of a composite system consisting of a quantum mechanical system and an environment by the renormalization group (RG) method. The solution obtained…
Derivation of Markovian master equation by renormalization group method
Yasusada Nambu, Shingo Kukita
We present a derivation of the Markovian master equation by the renormalization group method. Starting from a naive perturbative solution of the von Neumann equation, the reduced d…