Enlargement of optical Schrödinger's cat states

Sychev, Demid; Ulanov, Alexander E.; Pushkina, Anastasia A.; Richards, Matthew W.; Fedorov, Ilya A.; Lvovsky, A. I.

doi:10.1038/nphoton.2017.57

Cited by 163 publications

(135 citation statements)

References 39 publications

Supporting

Mentioning

129

Contrasting

Order By: Relevance

“…We find that pr(n, n) scales as ∼ |β| −5/2 which sets the fundamental limit on the success rate of our scheme. Such decrease of the success rate with the cat size is a typical feature of post-selected schemes for large cat state preparation [23,27,38]. Note the complementarity of our scheme with respect to Ref.…”

Section: Two-component Cat Statesmentioning

confidence: 76%

“…|cat β = N (|β + |−β ), where the two phase-conjugated coherent states, |β and |−β , play the role of the "alive" and "dead" cats in Schrödinger's famous Gedankenexperiment [37]. Cat states have been extensively studied in quantum physics due to their foundational importance and their applications in quantum information processing [7,22,23,27,38]. In principle, our procedure can prepare arbitrarily large cat states The photon-number distribution | j|χ | 2 (black line) approximates that of the ancilla input | j|φ | 2 (grey area) with the odd photon-number terms eliminated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Engineering Schrödinger cat states with a photonic even-parity detector

Thekkadath

Bell

Lvovsky

2020

Quantum

View full text Add to dashboard Cite

When two equal photon-number states are combined on a balanced beam splitter, both output ports of the beam splitter contain only even numbers of photons. Consider the time-reversal of this interference phenomenon: the probability that a pair of photon-numberresolving detectors at the output ports of a beam splitter both detect the same number of photons depends on the overlap between the input state of the beam splitter and a state containing only even photon numbers. Here, we propose using this even-parity detection to engineer quantum states containing only even photon-number terms. As an example, we demonstrate the ability to prepare superpositions of two coherent states with opposite amplitudes, i.e. two-component Schrödinger cat states. Our scheme can prepare cat states of arbitrary size with nearly perfect fidelity. Moreover, we investigate engineering more complex even-parity states such as four-component cat states by iteratively applying our even-parity detector.

show abstract

Section: Two-component Cat Statesmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Engineering Schrödinger cat states with a photonic even-parity detector

Thekkadath

Bell

Lvovsky

2020

Quantum

View full text Add to dashboard Cite

show abstract

“…These approaches will also require quantum memories. To our best knowledge, the largest created optical SCS to-date made use of two squeezed vacuum resources and a breeding step to create a squeezed SCS with ζ=2.15 and a fidelity of 0.74 (according to the fidelity defined by equation (7)) [52].…”

Section: Schrödinger Cat Statesmentioning

confidence: 99%

“…As exemplified by the work of Sychev et al [52], most SCS preparation methods result in a squeezed cat state,…”

Section: Schrödinger Cat Statesmentioning

confidence: 99%

Non-Gaussian and Gottesman–Kitaev–Preskill state preparation by photon catalysis

2019

View full text Add to dashboard Cite

Continuous-variable quantum-computing is the most scalable implementation of QC to date but requires non-Gaussian resources to allow exponential speedup and quantum correction, using error encoding such as Gottesman-Kitaev-Preskill (GKP) states. However, GKP state generation is still an experimental challenge. We show theoretically that photon catalysis, the interference of coherent states with single-photon states followed by photon-number-resolved detection, is a powerful enabler for non-Gaussian quantum state engineering such as exactly displaced single-photon states and Msymmetric superpositions of squeezed vacuum (SSV), including squeezed cat states (M = 2). By including photon-counting based state breeding, we demonstrate the potential to enlarge SSV states and produce GKP states.

show abstract

“…Furthermore, the photon-subtraction scheme is extended to generation of parity qubits [10]. The amplitude of cat states can be enlarged with conditional methods [4,11]. Cat states are resources for teleamplification of coherent states [12].…”

Section: Introductionmentioning

confidence: 99%

Purification of photon subtraction from continuous squeezed light by filtering

2017

View full text Add to dashboard Cite

Photon subtraction from squeezed states is a powerful scheme to create good approximation of so-called Schrödinger cat states. However, conventional continuous-wave-based methods actually involve some impurity in squeezing of localized wavepackets, even in the ideal case of no optical losses. Here we theoretically discuss this impurity, by introducing mode-match of squeezing. Furthermore, here we propose a method to remove this impurity by filtering the photon-subtraction field. Our method in principle enables creation of pure photonsubtracted squeezed states, which was not possible with conventional methods.

show abstract

Enlargement of optical Schrödinger's cat states

Cited by 163 publications

References 39 publications

Engineering Schrödinger cat states with a photonic even-parity detector

Engineering Schrödinger cat states with a photonic even-parity detector

Non-Gaussian and Gottesman–Kitaev–Preskill state preparation by photon catalysis

Purification of photon subtraction from continuous squeezed light by filtering

Contact Info

Product

Resources

About