Questions tagged [photonics]
It is the branch of physics and engineering concerned with the properties and transmission of photons. Use this tag for those questions about photonics which are relevant to quantum computing.
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1answer
39 views
Implementing BB84 protocol with easily-obtained consumer hardware
Following on from my question on educational quantum computing toys, I was wondering whether it is possible to implement the BB84 key distribution protocol with easily-obtained consumer hardware - ...
2
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2answers
58 views
Phase shifter acting on double rail states
In Nielsen and Chuang, it is stated that the photonic phase shift gate acts on the single photon states as $P|0\rangle \ = \ |0\rangle$ and $P|1\rangle \ = \ e^{i\Delta}|1\rangle$, where $\Delta \ = \ ...
6
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2answers
71 views
Multi-photon states in photonic quantum computing?
Within photonic quantum computing, one of the ways to represent information is the dual-rail representation of single-photon states ($c_0|01\rangle \ + \ c_1|10\rangle$). Is it possible to utilize ...
3
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2answers
78 views
Time-bin encoding qudits
Time-bin encoding is a technique used in Quantum information science to encode a qubit of information on a photon. Wikipedia
Is there a generalization for $n$-th level qudits?
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0answers
48 views
3
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2answers
57 views
Polarization and qubit information
It is my understanding that light, and its polarization, is used to transfer information in quantum computers, but how can the information encoded in say, an electron also be stored in light? I ...
9
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3answers
188 views
Do any educational quantum computing toys or devices exist?
Question inspired by this article from IEEE Spectrum on blocks containing different polarization filters for use in classrooms, and my previous question on representing the three-polarizing-filter ...
6
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2answers
143 views
Analyzing the three-polarizing-filter experiment as a quantum circuit
In the three-polarizing-filter experiment, two orthogonal polarizing filters block all light but then allow some amount when a third polarizing filter is placed oriented at a 45 degree angle between ...
7
votes
2answers
105 views
What about BosonSampling can be publicly verified?
Boson Sampling, sometimes stylized as BosonSampling, is an attractive candidate problem to establish quantum supremacy; the engineering problems appear more surmountable than those associated with a ...
3
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1answer
217 views
What does negative probability represent?
"Negative energies and probabilities should not be considered as nonsense. They are well-defined concepts mathematically, like a negative of money." -Paul Dirac
The abstract from Photon-phonon-photon ...
2
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1answer
75 views
Photonic Circuit Idea (Does this already exist?)
I have had a few ideas for circuits that I would like to get feedback on (do such things already exist, what utility they serve, etc).
Any suggestions on how I might graphically render these?
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14
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2answers
220 views
Is it possible to “calculate” the absolute value of a permanent using Boson Sampling?
In boson sampling, if we start with 1 photon in each of the first $M$ modes of an interferometer, the probability of detecting 1 photon in each output mode is: $|\textrm{Perm}(A)|^2$, where the ...
