Feedforward-enhanced Fock state conversion with linear optics

Švarc, Vojtěch; Hloušek, Josef; Nováková, Martina; Fiurášek, Jaromı́r; Ježek, Miroslav

doi:10.1364/oe.385609

Cited by 7 publications

(3 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Electronic delays with tens of picoseconds resolution and dynamic range of hundreds nanoseconds are necessary to compensate for the length fluctuations of optical communication channels 2,3 . DDLs are frequently utilized in photonic quantum technology 4,5 for photon coincidence detection [6][7][8] and switching [9][10][11][12] . These applications require synchronization of several single-photon detectors and active components, like modulators or switches.…”

Section: Introductionmentioning

confidence: 99%

Non-blocking programmable delay line with minimal dead time and tens of picoseconds jitter

Mazin,

Stejskal,

Dudka

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

We report a non-blocking high-resolution digital delay line based on an asynchronous circuit design. Field programmable gate array logic primitives were used as a source of delay and optimally arranged using combinatorial optimization. This approach allows for an efficient trade-off of the resolution and a delay range together with minimized dead time operation. We demonstrate the method by implementing the delay line adjustable from 23 ns up to 1635 ns with a resolution of 10 ps. We present a detailed experimental characterization of the device focusing on thermal instability, timing jitter, and pulse spreading, which represent three main issues of the asynchronous design. We found a linear dependence of the delay on the temperature with the slope of 0.2 ps•K −1 per a logic primitive. We measured the timing jitter of the delay to be in the range of 7 ps -165 ps, linearly increasing over the dynamic range of the delay. We reduced the effect of pulse spreading by introducing pulse shrinking circuits, and reached the overall dead time of 4 ns -22.5 ns within the dynamic range of the delay. The presented non-blocking delay line finds usage in applications where the dead time minimization is crucial, and tens of picoseconds excess jitter is acceptable, such as in many advanced photonic networks.

show abstract

Section: Introductionmentioning

confidence: 99%

Non-blocking programmable delay line with minimal dead time and tens of picoseconds jitter

Mazin,

Stejskal,

Dudka

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…A difference of the artificial coherent states here to conventional coherent light is that the photons of the artificial coherent state are correlated with others separated by multiples of the loop delay, this is typical for systems with time-delayed feedback [33] including lasers [34,35]. This quantum entanglement becomes accessible if an ordered (pulsed) stream of single photons is used, and enables production of linear cluster states, which has been realized recently [16,17], and feed-forward or fast modulators [14,[36][37][38] can be used to produce even more complex quantum states. We want to add that also lasers produce only approximately coherent states with entanglement of the stimulated photons via the gain medium [39][40][41][42], which is in practice inaccessible due to the impossibility of monitoring every quantum interaction in the system [43].…”

mentioning

confidence: 99%

Artificial Coherent States of Light by Multiphoton Interference in a Single-Photon Stream

et al. 2021

View full text Add to dashboard Cite

Coherent optical states consist of a quantum superposition of different photon number (Fock) states, but because they do not form an orthogonal basis, no photon number states can be obtained from it by linear optics. Here we demonstrate the reverse, by manipulating a random continuous single-photon stream using quantum interference in an optical Sagnac loop, we create engineered quantum states of light with tunable photon statistics, including approximate weak coherent states. We demonstrate this experimentally using a true single-photon stream produced by a semiconductor quantum dot in an optical microcavity, and show that we can obtain light with g ð2Þ ð0Þ → 1 in agreement with our theory, which can only be explained by quantum interference of at least 3 photons. The produced artificial light states are, however, much more complex than coherent states, containing quantum entanglement of photons, making them a resource for multiphoton entanglement.

show abstract

“…A difference of the artificial coherent states here to conventional coherent light is that the photons here are entangled with others separated by multiples of the loop delay. This quantum entanglement becomes accessible if an ordered (pulsed) stream of single photons is used, and enables production of linear cluster states which has been realized recently [15,16], and feed-forward or fast modulators [13,[30][31][32] can be used to produce even more complex quantum states. We want to add that also lasers produce only approximately coherent states, entanglement of the stimulated photons via the gain medium is subject to a long debate [33][34][35][36].…”

mentioning

confidence: 99%

Artificial coherent states of light by multi-photon interference in a single-photon stream

Steindl,

Snijders,

Westra

et al. 2020

Preprint

View full text Add to dashboard Cite

Coherent optical states consist of a quantum superposition of different photon number (Fock) states, but because they do not form an orthogonal basis, no photon number states can be obtained from it by linear optics. Here we demonstrate the reverse, by manipulating a random continuous single-photon stream using quantum interference in an optical Sagnac loop, we create engineered quantum states of light with tunable photon statistics, including approximately coherent states. We demonstrate this experimentally using a true single-photon stream produced by a semiconductor quantum dot in an optical microcavity, and show that we can obtain light with g (2) (0) → 1 in agreement with our theory, which can only be explained by quantum interference of at least 3 photons. The produced artificial light states are, however, much more complex than coherent states, containing quantum entanglement of photons, making them a resource for multi-photon entanglement.

show abstract

Feedforward-enhanced Fock state conversion with linear optics

Cited by 7 publications

References 43 publications

Non-blocking programmable delay line with minimal dead time and tens of picoseconds jitter

Non-blocking programmable delay line with minimal dead time and tens of picoseconds jitter

Artificial Coherent States of Light by Multiphoton Interference in a Single-Photon Stream

Artificial coherent states of light by multi-photon interference in a single-photon stream

Contact Info

Product

Resources

About