What is the difference between asymmetric, symmetric, and quantum encryption?

I know that symmetric encryption is the least secure followed by asymmetric and quantum being the most secure, but can someone please explain the difference between asymmetric, symmetric, and quantum encryption?
Brent JohnsonAsked:
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Which is "least secure" or "most secure" can depend on how you use the encryption, what your keys are, and what you want to be secure against, but essentially, symmetric means that if you know how to encrypt, then you will also know how to decrypt, and vice versa.  asymmetric means that ability to go in one direction does not imply ability to go the other direction, and quantum literally refers to the minimum amount of any physical entity involved in an interaction, and generally refers to systems involving wave functions with complex values. When applied to cryptography, such systems can make it impossible to perform a man-in-the-middle attack without detection.  Hypothetically, such systems might also enable the breaking of some kinds of asymmetric encryption that would be impractical using classical computations.

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Giovanni HewardCommented:
Symmetric Encrypt/DecryptAsymmetric Encrypt/Decrypt
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