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Results tagged with quantum-operation
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user 14239
For questions about quantum channels or more generally quantum maps and the related formalism. For questions about unitary operations, please use quantum-gate instead.
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Can you perform quantum process tomography using an orthonormal basis the contains non Hermi...
In the thesis "Efficient Simulation of Random Quantum States and Operators" on page 25 there is a portion of text explaining a method for quantum process tomography. It claims that states from an orth …
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Can a qubit be entangled with an arbitrary quantum state, without altering it?
For example, if an adversary were to get hold of one half of an entangled 2-qubit quantum state, $|\psi \rangle$, travelling along a channel, would they be able to entangle one of their own qubits wi …
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How to calculate the average fidelity of an amplitude damping channel
An answer to this question shows how to calculate the average fidelity of a depolarizing channel. How would one go about calculating this for an amplitude dampening channel? I tried working out the ma …
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How are eavesdroppers detected when using BB84 in the presence of noise?
I would like to expand upon this question: What is the probability of detecting Eve's tampering, in BB84?
Let's say that when the receiver (colloquially referred to as Bob) receives a qubit and measur …
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Do sequences of operations (including measurements) applied to different halves of an entang...
Let us say $A$ has one half of an entangled qubit pair, and $B$ has the other half. $A$ may be able to perform any type of operation on their half of the pair, such as unitary operations, entangling t …
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What is the best method for estimating average channel fidelity?
This thesis shows an efficient way to estimate average channel fidelity (in chapter 4). However, it is somewhat old (from 2005). Are there any better methods out there? By better I mean: are there oth …
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What is the best quantum process tomography method?
This question is somewhat related to this question. What is currently the best method for quantum process tomography? By best I mean, the one that can achieve the best accuracy of estimation per qubit …
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Simulate a quantum channel with a certain fidelity
I am looking for an easy-to-use framework for simulating a quantum channel that can accept the desired average fidelity of the channel as input.
For example, if I want a channel with 98% average fidel …
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Is there a name for a gate that 'moves' one qubit to a new position via multiple SWAP gates?
Let's say there is a qubit at position $i$, and I want to move it to position $i'$. Without loss of generality, let's say $i < i'$. By 'move it' I mean, perform multiple $SWAP$ operations so that ever …
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Can quantum error correction work on any type of channel?
It says on wikipedia that quantum error correction can (at best) correct phase flips and bit flips. A popular form of representing a quantum channel is in its Kraus representation (scroll down to sect …
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Can Gate Set Tomography work on Quantum Channels?
I stumbled across a new paper on gate set tomography. Can gate set tomography be applied to a quantum channel or multiple quantum channels? Will the same advantages still apply of not having to 'rely …
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