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Continuous-variable quantum tomography of high-amplitude states
Ekaterina Fedotova, Nikolai Kuznetsov, Egor Tiunov +2
Quantum state tomography is an essential component of modern quantum technology. In application to continuous-variable harmonic-oscilator systems, such as the electromagnetic field…
Reconstructing complex states of a 20-qubit quantum simulator
Murali K. Kurmapu, V. V. Tiunova, E. S. Tiunov +6
A prerequisite to the successful development of quantum computers and simulators is precise understanding of physical processes occurring therein, which can be achieved by measurin…
Quantum computing at the quantum advantage threshold: a down-to-business review
A. K. Fedorov, N. Gisin, S. M. Beloussov +1
It is expected that quantum computers would enable solving various problems that are beyond the capabilities of the most powerful current supercomputers, which are based on classic…
Polynomial unconstrained binary optimisation inspired by optical simulation
Dmitry A. Chermoshentsev, Aleksei O. Malyshev, Mert Esencan +5
We propose an algorithm inspired by optical coherent Ising machines to solve the problem of polynomial unconstrained binary optimization (PUBO). We benchmark the proposed algorithm…
Production and applications of non-Gaussian quantum states of light
A. I. Lvovsky, Philippe Grangier, Alexei Ourjoumtsev +3
This review covers recent theoretical and experimental efforts to extend the application of the continuous-variable quantum technology of light beyond "Gaussian" quantum states, su…
Quantum-enhanced interferometry with large heralded photon-number states
G. S. Thekkadath, M. E. Mycroft, B. A. Bell +11
Quantum phenomena such as entanglement can improve fundamental limits on the sensitivity of a measurement probe. In optical interferometry, a probe consisting of entangled phot…
Quantum-inspired annealers as Boltzmann generators for machine learning and statistical physics
Alexander E. Ulanov, Egor S. Tiunov, A. I. Lvovsky
Quantum simulators and processors are rapidly improving nowadays, but they are still not able to solve complex and multidimensional tasks of practical value. However, certain numer…
Experimental quantum homodyne tomography via machine learning
E. S. Tiunov, V. V. Tiunova, A. E. Ulanov +2
Complete characterization of states and processes that occur within quantum devices is crucial for understanding and testing their potential to outperform classical technologies fo…
Entangled resource for interfacing single- and dual-rail optical qubits
David Drahi, Demid V. Sychev, Khurram K. Pirov +4
Today's most widely used method of encoding quantum information in optical qubits is the dual-rail basis, often carried out through the polarisation of a single photon. On the othe…
Annealing by simulating the coherent Ising machine
Egor S. Tiunov, Alexander E. Ulanov, A. I. Lvovsky
The coherent Ising machine (CIM) enables efficient sampling of low-lying energy states of the Ising Hamiltonian with all-to-all connectivity by encoding the spins in the amplitudes…
Darkness of two-mode squeezed light in Λ-type atomic system
E. S. Moiseev, Arina Tashchilina, S. A. Moiseev +1
We show that, under certain circumstances, an optical field in a two-mode squeezed vacuum (TMSV) state can propagate through a lossy atomic medium without degradation or evolution.…
Entanglement and teleportation between polarization and wave-like encodings of an optical qubit
Demid V. Sychev, Alexander E. Ulanov, Anastasia A. Pushkina +3
Light is an irreplaceable means of communication among various quantum information processing and storage devices. Due to their different physical nature, some of these devices cou…
Quantum-secured blockchain
E. O. Kiktenko, N. O. Pozhar, M. N. Anufriev +5
Blockchain is a distributed database which is cryptographically protected against malicious modifications. While promising for a wide range of applications, current blockchain plat…
Breeding the optical Schroedinger's cat state
Demid V. Sychev, Alexander E. Ulanov, Anastasia A. Pushkina +3
Superpositions of macroscopically distinct quantum states, introduced in Schroedinger's famous Gedankenexperiment, are an epitome of quantum "strangeness" and a natural tool for de…
Synthesis of the Einstein-Podolsky-Rosen entanglement in a sequence of two single-mode squeezers
Ilya A. Fedorov, Alexander E. Ulanov, Yury V. Kurochkin +1
Synthesis of the Einstein-Podolsky-Rosen entangled state --- the primary entangled resource in continuous-variable quantum-optical information processing --- is a technological cha…
A scheme for quantum teleportation between discrete and continuous encodings of an optical qubit
Alexander E. Ulanov, Demid Sychev, Anastasia A. Pushkina +2
Transfer of quantum information between physical systems of a different nature is a central matter in quantum technologies. Particularly challenging is the transfer between discret…
Loss-tolerant quantum enhanced metrology and state engineering via the reverse Hong-Ou-Mandel effect
Alexander E. Ulanov, Ilya A. Fedorov, Demid Sychev +2
Preparing highly entangled quantum states between remote parties is a major challenge for quantum communications [1-8]. Particularly promising in this context are the N00N states,…
Undoing the effect of loss on quantum entanglement
Alexander E. Ulanov, Ilya A. Fedorov, Anastasia A. Pushkina +3
Entanglement distillation is a process via which the strength and purity of quantum entanglement can be increased probabilistically. It is a key step in many quantum communication…
Quantum vampire: collapse-free action at a distance by the photon annihilation operator
Ilya A. Fedorov, Alexander E. Ulanov, Yury V. Kurochkin +1
A nonclassical state of light is distributed, via a beam splitter, between two remote parties. One of the parties applies the photon annihilation operator to its portion of the sta…
Efficiencies of Quantum Optical Detectors
Daniel Hogg, Dominic W. Berry, A. I. Lvovsky
We propose a definition for the efficiency that can be universally applied to all classes of quantum optical detectors. This definition is based on the maximum amount of optical lo…
Generation and tomography of arbitrary qubit states in a transient collective atomic excitation
Travis Brannan, Zhongzhong Qin, Andrew MacRae +1
We demonstrate the generation of heralded Fock-basis qubits from transient collective spin excitations in a hot atomic vapor. The collective spin excita…
Tomography of a multimode quantum black box
Ilya A. Fedorov, Aleksey K. Fedorov, Yury V. Kurochkin +1
We report a technique for experimental characterization of an -mode quantum optical process, generalizing the single-mode coherent-state quantum-process tomography method [M. Lo…
Opto-mechanical micro-macro entanglement
R. Ghobadi, S. Kumar, B. Pepper +3
We propose to create and detect opto-mechanical entanglement by storing one component of an entangled state of light in a mechanical resonator and then retrieving it. Using micro-m…
Squeezed light
A. I. Lvovsky
The squeezed state of the electromagnetic field can be generated in many nonlinear optical processes and finds a wide range of applications in quantum information processing and qu…