331 citations · 745 across the 15 of their papers we have counts for
15 papers
Quantum receiver for phase-shift keying at the single photon level
Jasminder S. Sidhu, Shuro Izumi, Jonas S. Neergaard-Nielsen +2
Quantum enhanced receivers are endowed with resources to achieve higher sensitivities than conventional technologies. For application in optical communications, they provide improv…
Adaptive generalized measurement for unambiguous state discrimination of quaternary phase-shift-keying coherent states
Shuro Izumi, Jonas S. Neergaard-Nielsen, Ulrik L. Andersen
Generalized quantum measurements identifying non-orthogonal states without ambiguity often play an indispensable role in various quantum applications. For such unambiguous state di…
Limit of Gaussian operations and measurements for Gaussian state discrimination, and its application to state comparison
David E. Roberson, Shuro Izumi, Wojciech Roga +3
We determine the optimal method of discriminating and comparing quantum states from a certain class of multimode Gaussian states and their mixtures when arbitrary global Gaussian o…
Experimental demonstration of a quantum receiver beating the standard quantum limit at the telecom wavelength
Shuro Izumi, Jonas S. Neergaard-Nielsen, Shigehito Miki +2
Discrimination of coherent states beyond the standard quantum limit (SQL) is an important tasknot only for quantum information processing but also for optical coherent communicatio…
Tomography of a Feedback Measurement with Photon Detection
Shuro Izumi, Jonas S. Neergaard-Nielsen, Ulrik L. Andersen
Quantum measurement is essential to both the foundations and practical applications of quantum information science. Among many possible models of quantum measurement, feedback meas…
Distributed quantum sensing in a continuous variable entangled network
Xueshi Guo, Casper R. Breum, Johannes Borregaard +6
Networking plays a ubiquitous role in quantum technology. It is an integral part of quantum communication and has significant potential for upscaling quantum computer technologies…
Tomography of a displacement photon counter for discrimination of single-rail optical qubits
Shuro Izumi, Jonas S. Neergaard-Nielsen, Ulrik L. Andersen
We investigate the performance of a Kennedy receiver, which is known as a beneficial tool in optical coherent communications, to the quantum state discrimination of the two superpo…
Fundamental precision limit of a Mach-Zehnder interferometric sensor when one of the inputs is the vacuum
Masahiro Takeoka, Kaushik P. Seshadreesan, Chenglong You +2
In the lore of quantum metrology, one often hears (or reads) the following no-go theorem: If you put vacuum into one input port of a balanced Mach-Zehnder Interferometer, then no m…
Projective measurement onto arbitrary superposition of coherent state bases
Shuro Izumi, Masahiro Takeoka, Kentaro Wakui +3
One of the peculiar features in quantum mechanics is that a superposition of macroscopically distinct states can exits. In optical system, this is highlighted by a superposition of…
Optical phase estimation via coherent state and displaced photon counting
Shuro Izumi, Masahiro Takeoka, Kentaro Wakui +3
We consider the phase sensing via weak optical coherent state at quantum limit precision. A new detection scheme for the phase estimation is proposed which is inspired by the subop…
Efficient generation of twin photons at telecom wavelengths with 10 GHz repetition-rate tunable comb laser
Rui-Bo Jin, Ryosuke Shimizu, Isao Morohashi +10
Efficient generation and detection of indistinguishable twin photons are at the core of quantum information and communications technology (Q-ICT). These photons are conventionally…
Performance gain of displacement receiver with optimized prior probability
M. Fujiwara, S. Izumi, M. Takeoka +1
We numerically study the performance of the displacement based quantum receiver for the discrimination of weak 3- and 4-phase-shift keyed (PSK) coherent state signals. We show that…
Ultrabroadband direct detection of nonclassical photon statistics at telecom wavelength
Kentaro Wakui, Yujiro Eto, Hugo Benichi +7
Broadband light sources play essential roles in diverse fields, such as high-capacity optical communications, optical coherence tomography, optical spectroscopy, and spectrograph c…
Quantum receivers with squeezing and photon-number-resolving detectors
Shuro Izumi, Masahiro Takeoka, Kazuhiro Ema +1
We propose quantum receivers with optical squeezing and photon-number-resolving detector (PNRD) for the near-optimal discrimination of quaternary phase-shift-keyed coherent state s…
Displacement receiver for phase-shift-keyed coherent states
Shuro Izumi, Masahiro Takeoka, Mikio Fujiwara +4
Quantum receiver is an important tool for overcoming the standard quantum limit (SQL) of discrimination errors in optical communication. We theoretically study the quantum receiver…