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pro vyhledávání: '"Kondo Yasushi"'
Precise control of quantum systems is one of the most important milestones for achieving practical quantum technologies, such as computation, sensing, and communication. Several factors deteriorate the control precision and thus their suppression is
Externí odkaz:
http://arxiv.org/abs/2405.11170
Environmental noises cause the relaxation of quantum systems and decrease the precision of operations. Apprehending the relaxation mechanism via environmental noises is essential for building quantum technologies. Relaxations can be considered a proc
Externí odkaz:
http://arxiv.org/abs/2404.03937
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 energy of the environment. We consider two types of quantum refrigerat
Externí odkaz:
http://arxiv.org/abs/2210.02681
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 control suffers from undesirable effects caused by systematic errors.
Externí odkaz:
http://arxiv.org/abs/2203.05754
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 control. A composite pulse (CP) can help compensate for the effects of sy
Externí odkaz:
http://arxiv.org/abs/2112.12945
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 to obtain high sensitivity. However, the smaller magnetic fields becom
Externí odkaz:
http://arxiv.org/abs/2108.02463
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 preparation, time evolution during which information of the parameters is enco
Externí odkaz:
http://arxiv.org/abs/2103.11612
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. Quantum devices often require extreme conditions such as very low tempera
Externí odkaz:
http://arxiv.org/abs/2007.11382
Publikováno v:
Phys. Rev. A 102, 022602 (2020)
Simultaneous quantum estimation of multiple parameters has recently become essential in quantum metrology. Although the ultimate sensitivity of a multiparameter quantum estimation in noiseless environments can beat the standard quantum limit that eve
Externí odkaz:
http://arxiv.org/abs/2004.00720
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